(q19) The scores of a mid term exam are distributed normally with mean 70 and standard deviation 15. What percentage of students would have the score between 60 and 75?
, where µ is the average value.

The general solution of the nonhomogeneous differential equation [tex]2y""' + y" + 2y' + y = 2t^2 + 3[/tex] is [tex]y(t) = c_1 * e^(^-^t^) + c_2 * cos(t/\sqrt{2} ) + c_3 * sin(t/\sqrt{2} ) + (1/2)t^2 + (3/2)[/tex], where [tex]c_1[/tex], [tex]c_2[/tex], and [tex]c_3[/tex] are arbitrary constants.

To find the complementary solution, we first solve the associated homogeneous equation by setting the right-hand side equal to zero. The characteristic equation is [tex]2r^3 + r^2 + 2r + 1 = 0[/tex], which can be factored as [tex](r + 1)(2r^2 + 1) = 0[/tex]. Solving for the roots, we have r = -1 and r = ±i/√2. Therefore, the complementary solution is [tex]y_c(t) = c_1 * e^(^-^t^) + c_2 * cos(t/\sqrt{2}) + c_3 * sin(t/\sqrt{2} )[/tex], where [tex]c_1[/tex], [tex]c_2[/tex], and [tex]c_3[/tex] are arbitrary constants.

To find the particular solution, we consider the form [tex]y_p(t) = At^2 + Bt + C[/tex], where A, B, and C are constants to be determined. Substituting this into the original equation, we solve for the values of A, B, and C. After simplification, we find A = 1/2, B = 0, and C = 3/2. Hence, the particular solution is [tex]y_p(t) = (1/2)t^2 + (3/2)[/tex].

Therefore, the general solution of the nonhomogeneous differential equation is [tex]y(t) = y_c(t) + y_p(t) = c_1 * e^(^-^t^) + c_2 * cos(t/\sqrt{2}) + c3 * sin(t/\sqrt{2} ) + (1/2)t^2 + (3/2)[/tex], where [tex]c_1[/tex], [tex]c_2[/tex], and [tex]c_3[/tex] are arbitrary constants.

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Answer:10 minutes

Step-by-step explanation:The amount of water in Pool A after t minutes can be represented by the function A(t) = 380 - 9t, where 9t is the amount of water lost due to the leak. The amount of water in Pool B after t minutes can be represented by the function B(t) = 420 - 13t, where 13t is the amount of water lost due to the leak.

To find when the two pools have the same amount of water, we need to solve the equation A(t) = B(t):

380 - 9t = 420 - 13t

4t = 40

t = 10

Therefore, the two pools will have the same amount of water after 10 minutes. To find how much water will be in the pools at that time, we can substitute t = 10 into either A(t) or B(t):

A(10) = 380 - 9(10) = 290

B(10) = 420 - 13(10) = 290

Therefore, both pools will have 290 gallons of water after 10 minutes.

Using the quadratic formula, the exact solutions of the equation x^2 - 5x - 2 = 0 are:

x = (-b ± √(b^2 - 4ac)) / (2a)

To find the solutions of a quadratic equation in the form ax^2 + bx + c = 0, we can use the quadratic formula. In this case, the equation is x^2 - 5x - 2 = 0, where a = 1, b = -5, and c = -2.

Applying the quadratic formula, we have:

x = (-(-5) ± √((-5)^2 - 4(1)(-2))) / (2(1))

= (5 ± √(25 + 8)) / 2

= (5 ± √33) / 2

Therefore, the exact solutions of the equation x^2 - 5x - 2 = 0 are (5 + √33) / 2 and (5 - √33) / 2.

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N(p) = 1/√2 (-1,0,1) and  N.(p) = (0,0,0) . (1/√2) (-1,0,1) = 0.

Given a regular surface S given by a map x:

R2 ⟶ R3(u, v) ⟼ (u + 0, - v, uv).

For a point p = (0,0,0) in S, we are required to compute N . (p), N. (p)

We have, x(u,v) = (u + 0, -v, uv)

∴ x1 = 1, x2 = -1, x3 = v

N(p) = 1/√(1+u²+v²) [ux1 × vx2 + ux2 × vx3 + ux3 × vx1]

Here, u = 0, v = 0

∴ x(0,0) = (0,0,0)

∴ x1(0,0) = 1, x2(0,0) = -1, x3(0,0) = 0

Now, x1 × x2 = 1 × (-1) - 0 = -1, x2 × x3 = (-1) × 0 - 0 = 0, x3 × x1 = 0 × 1 - (-1) = 1

Hence, N(p) = 1/√2 (-1,0,1)

Also, N.(p) = (0,0,0) . (1/√2) (-1,0,1) = 0.

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Show that there are infinitely many positive eigenvalues by finding an equation whose roots are those eigenvalues, and show graphically that there are infinitely many roots.

Solution: I = 0 is not an eigenvalue. The general form of the eigenvalue problem is L(y) = λw(x)y = 0, where L(y) is a Sturm-Liouville operator, w(x) is a weight function and λ is an eigenvalue. The eigenvalue problem is a Sturm-Liouville problem and is self-adjoint. Eigenvalues are real and eigenfunctions corresponding to different eigenvalues are orthogonal with respect to the weight function. There are no negative eigenvalues since we have a fixed boundary condition at x = 0. So, the smallest eigenvalue is zero. For finding the eigenvalues, we have to solve the differential equation and boundary conditions, g″ + Ag = 0, y(0) + y′(0) = 0, y(1) = 0.

The general solution to the differential equation is:

y = c1 cos(αx) + c2 sin(αx),

where α = √A.

The boundary condition at x = 0 is: y(0) + y′(0) = c1 + αc2 = 0.

The boundary condition at x = 1 is: y(1) = c1 cos(α) + c2 sin(α) = 0.

We get the eigenvalues as follows: c1 = -αc2, c2 = c2, tan(α) = α. ⇒αtan(α) = 0.Tan function is negative in the second and fourth quadrants and positive in the first and third quadrants, so there are infinitely many positive roots of α.For finding the roots graphically, we draw the curves y = tan(α) and y = α. The roots of the equation tan(α) = α correspond to the intersection points of these two curves. The figure below shows that there are infinitely many eigenvalues.

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∫∫∫E xz dV = (27π) / 8

This is the value of the triple integral when evaluated over the region E in the first octant inside the ball of radius 3.

To evaluate the triple integral ∫∫∫E xz dV, where E is the region in the first octant inside the ball of radius 3, we can use spherical coordinates.

In spherical coordinates, the volume element dV is given by dV = ρ² sin φ dρ dθ dφ, where ρ represents the radial distance, φ represents the inclination angle, θ represents the azimuthal angle.

The region E in spherical coordinates can be defined as follows:

0 ≤ ρ ≤ 3

0 ≤ φ ≤ π/2

0 ≤ θ ≤ π/2

Now we can rewrite the integral using spherical coordinates:

∫∫∫E xz dV = ∫∫∫E (ρ cos θ)(ρ sin φ) ρ² sin φ dρ dθ dφ

Integrating with respect to ρ, θ, and φ over their respective ranges, we get:

∫∫∫E xz dV = ∫(0 to π/2)∫(0 to π/2)∫(0 to 3) (ρ⁴ sin φ cos θ) dρ dθ dφ

Evaluating this triple integral will give the final numerical result.

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The price of the stock 15 days before it reached its lowest value was $46 (approximate value).

f(t) = {50-.2t ; t ≤ 50} {40+.1t ; t > 50}Let's first find out the day when the lowest value is reached:f(t) = 50-.2t50-.2t = 40+.1t0.3t = 10t = 33.33 ≈ 34 days after December 31, 2015So, the lowest value is reached 34 days after December 31, 2015.

Now, let's find out the value of the stock 15 days before it reached its lowest value:t = 34 - 15 = 19Substituting t = 19 in the given function,f(t) = {50-.2t ; t ≤ 50} {40+.1t ; t > 50}= 50 - 0.2(19)= 50 - 3.8= 46.2Hence, the price of the stock 15 days before it reached its lowest value was $46 (approximate value).

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The solution to all parts is shown below:

(a) The level of significance is 0.01.

(b) Chi-square ≈ 3.916

(c) The P-value is approximately 0.416.

(a) The level of significance is 0.01.

(b) To find the value of the chi-square statistic for the sample, we need to calculate the expected frequencies and then perform the chi-square test. The expected frequencies can be calculated using the formula:

Expected frequency = (row total x column total) / grand total

The table below shows the expected frequencies:

Pottery Type

Site Type Mesa Verde

Black-on-White McElmo

Black-on-White Mancos

Black-on-White Row Total

Mesa Top (189 x247)/628  (189 x 195)/628         (189 x 186)/628

                        ≈ 74.67            ≈ 58.72                  ≈ 56.61 189

Cliff-Talus (213x247)/628     (213x195)/628            (213x186)/628

                    ≈ 83.74                     ≈ 66.48                  ≈ 63.78 213

Canyon Bench (226x247)/628   (226x195)/628        (226x186)/628

                                 ≈ 89.02                 ≈ 71.05           ≈ 67.93 226

Column Total           247                         195                              186         628

Now, we can calculate the chi-square statistic:

Chi-square = Σ [(Observed frequency - Expected frequency)² / Expected frequency]

Chi-square = [(79 - 74.67)² / 74.67] + [(65 - 58.72)² / 58.72] + [(45 - 56.61)² / 56.61] + [(76 - 83.74)² / 83.74] + [(67 - 66.48)² / 66.48] + [(70 - 63.78)² / 63.78] + [(92 - 89.02)² / 89.02] + [(63 - 71.05)² / 71.05] + [(71 - 67.93)² / 67.93]

Chi-square ≈ 3.916

(c) To find or estimate the P-value of the sample test statistic, we need to compare the chi-square statistic to the chi-square distribution.

so, degrees of freedom= (number of rows - 1) x (number of columns - 1)

= (3-1) x (3-1)

= 4.

So, the P-value is approximately 0.416.

(d) Based on the answers in parts (a) to (c), we will fail to reject the null hypothesis. Since the P-value (0.416) is greater than the level of significance (0.01), we do not have sufficient evidence to reject the null hypothesis that site type and pottery type are independent.

(e) In the context of the application, at the 1% level of significance, we do not have enough evidence to conclude that site and pottery type are not independent.

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The first and second pairs of functions are linearly independent, while the third pair of functions are linearly dependent Since the Wronskian is zero, it indicates that the functions are linearly dependent.

The Wronskian is a term used in mathematics to determine whether two functions are linearly independent. The Wronskian is a determinant of functions that is used to determine whether or not they are linearly independent.

The Wronskian of a set of functions f1, f2, ..., fn is denoted as W(f1, f2, ..., fn).

The Wronskian of the functions can be found using the following formula:

W(f1, f2) = f1(x) * f2'(x) - f1'(x) * f2(x).

Therefore, we have:

1. f1(x) = 2x + 3 and f2(x) = 4f1(x) - 1 = 2x + 3 and f2(x) = 8x + 11

Then, we find the Wronskian of f1 and f2 as shown below:

W(f1, f2) = f1(x) * f2'(x) - f1'(x) * f2(x) = (2x + 3) * (8) - (2) * (8x + 11)

= 16x + 24 - 16x - 22 = 2

Since the Wronskian is not zero, it indicates that the functions are linearly independent.

2. y1 = x^2 + 1 and y2 = x*y1= x^2 + 1 and y2 = x(x^2 + 1)= x^3 + x. We find the Wronskian of y1 and y2 as shown below:

W(y1, y2) = y1(x) * y2'(x) - y1'(x) * y2(x) = (x^2 + 1) * (3x^2 + 1) - (2x) * (x^3 + x)

= 3x^4 + 4x^2 + 1 - 2x^4 - 2x^2 = x^4 + 2x^2 + 1

Since the Wronskian is not zero, it indicates that the functions are linearly independent.

3. y1 = ln(x) and y2 = 0 = ln(x) and y2 = 0

We find the Wronskian of y1 and y2 as shown below:

W(y1, y2) = y1(x) * y2'(x) - y1'(x) * y2(x) = (ln(x)) * (0) - (1/x) * (0) = 0

Since the Wronskian is zero, it indicates that the functions are linearly dependent.

Therefore, the first and second pairs of functions are linearly independent, while the third pair of functions are linearly dependent.

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(a) We calculated the curl of the given vector field F, which is -2i - k.

(b) We analyzed whether F is the gradient of a scalar-valued function and concluded that it is not.

(c) We corrected the reported vector field based on a given path, resulting in the corrected vector field F = 2cos(2t)i - 2sin(2t)j + 2cos(2t)k.

(a) Calculating the Curl of F:

Given the vector field F = yi - 2zj + yk, we need to find the curl of F. The curl of a vector field F is defined as the vector operator given by the cross product of the del operator (∇) with F.

Curl F = ∇ x F

Using the definition of the curl, we can evaluate the cross product:

Curl F = (∂/∂x)i + (∂/∂y)j + (∂/∂z)k x (yi - 2zj + yk)

Expanding the cross product and simplifying, we obtain:

Curl F = (∂(yk)/∂y - ∂(2zj)/∂z)i + (∂(yi)/∂x - ∂(yk)/∂z)j + (∂(2zj)/∂y - ∂(yi)/∂y)k

Curl F = 0i + 0j + (-2)i - (-1)k

Curl F = -2i - k

Therefore, the curl of F is -2i - k.

(b) Gradient of a Scalar-valued Function:

To determine if F is the gradient of a scalar-valued function f(xy, z) of class C², we can use a property that states that if a vector field F is the gradient of some function f, then its curl must be zero (∇ x F = 0).

From part (a), we found that Curl F = -2i - k, which is not zero. Therefore, we can conclude that F is not the gradient of a scalar-valued function f(xy, z).

(c) Correcting the Vector Field:

Suppose we have a path described by x(t) = (sin(2t), -2cos(2t), sin(2t)). Ensign Sulu claims that this path is a flow line of the Romulan vector field F mentioned earlier but forgot to include a constant factor.

To find the correct vector field, we need to find the velocity vector of the given path x(t). Taking the derivative with respect to t, we have:

v(t) = (2cos(2t), 4sin(2t), 2cos(2t))

Comparing the velocity vector to F = yi - 2zj + yk, we can see that the x-component of F matches the x-component of v(t). However, the y-component and z-component of F need adjustment. Let's introduce a constant factor of 'c' to correct the field:

F = ci - 2zj + ck

Now, equating the corresponding components of v(t) and F:

2cos(2t) = c

4sin(2t) = -2z

2cos(2t) = c

From the first and third equations, we can conclude that c = 2cos(2t).

Substituting this value into the second equation, we have:

4sin(2t) = -2z

Simplifying, we find:

z = -2sin(2t)

Therefore, the corrected vector field is:

F = 2cos(2t)i - 2sin(2t)j + 2cos(2t)k

This corrected vector field represents the Romulan vector field Ensign Sulu intended to report.

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A study of all the students at a small college showed a mean age of 20.4 and a standard deviation of 2.7 years.

(a) These numbers are statistics because they are based on a sample of students from a small college. They are not certain, but estimates.

(b) The mean age is labeled with the symbol x and the standard deviation with the symbol s. The sample size is not given, so we cannot use the symbol n to represent it.

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The value of any number a, including 0, is given by |a|, where |-a| = |a|.

To evaluate 5|x³ - 21 + 7| when x = -2, substitute -2 in the expression to get:5|-2³ - 21 + 7| = 5|(-8) - 21 + 7| = 5|-22| = 5(22) = 110Thus, the value of 5|x³ - 21 + 7| when x = -2 is 110.

The absolute value bars around the expression |x³ - 21 + 7| ensure that the result is positive and the whole expression is then multiplied by 5.What is Absolute Value?

Absolute value is a measure of the distance between a number and zero on a number line. The value of a quantity without regard to its sign is known as the absolute value.

If the value inside the absolute value brackets is positive, the result of the absolute value equation is the same as the value inside the brackets.If the value inside the absolute value brackets is negative,

the result of the absolute value equation is the opposite (negation) of the value inside the brackets.

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Option D, "The square of the slope is equal to the fraction of variation in Y that is explained by regression on X".

The least squares regression line or regression line is defined as a straight line that is used to represent the relationship between two variables X and Y in the linear regression model. The slope of the regression line represents the average rate of change in Y (dependent variable) for each unit change in X (independent variable). The slope of the least squares regression line can be either positive, negative or zero, depending on the nature of the relationship between the two variables X and Y. Also, it is calculated using the formula y = mx + b. Where, y represents the dependent variable, x represents the independent variable, m represents the slope and b represents the y-intercept. Hence, the correct option among the given alternatives is option D.

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The mortgage of $133,000 with a monthly payment of $1,284.37 at an annual interest rate of 10.8% (APR) will be paid off in around 103 months. For the student loan of $10,000 with a monthly payment of $200 and an annual interest rate of 8% (APR), it will take approximately 63 months to pay off.

For the first scenario, with a fixed-rate mortgage of $133,000, an annual interest rate of 10.8% (APR), and a monthly payment of $1,284.37, it will take approximately 103 months to pay off the mortgage. This can be calculated by dividing the mortgage amount by the monthly payment.

In the second scenario, with a student loan amount of $10,000, an annual interest rate of 8% (APR), and a monthly payment of $200, it will take approximately 63 months to pay off the loan. Similar to the previous calculation, this can be determined by dividing the loan amount by the monthly payment.

In the third scenario, with a 30-year fixed-rate mortgage, a monthly payment of $1,010, and an interest rate of 4.8% (APR), the original mortgage amount can be calculated using an amortization formula or an online mortgage calculator. The original mortgage amount is approximately $167,782.88.

Overall, these calculations provide insights into the repayment timelines and original loan amounts for the given mortgage and loan scenarios.

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Answer:

the formula for finding a triangle leg is A²  +  B² = C²

a) The image of the unit circle under f is a spiral that starts at the point (0,0) and moves infinitely upwards around the vertical line x = log(7).

b) The image of the positive imaginary axis under f is an infinite line that passes through the point (0, log(7)) and moves upwards towards infinity.

c) The image of the positive real axis under f is the vertical line x = log(7).The given function is f(x) = log(7)

.a) The image of the unit circle under f is a spiral that starts at the point (0,0) and moves infinitely upwards around the vertical line x = log(7). This spiral gets closer and closer to the vertical line x = log(7) as it spirals upward. The points on the unit circle that are closest to the vertical line x = log(7) are those that are closest to the point (1,0). b) The image of the positive imaginary axis under f is an infinite line that passes through the point (0, log(7)) and moves upwards towards infinity. This is because the function f(x) = log(7) only takes positive values, so the image of the positive imaginary axis under f is a vertical line.c) The image of the positive real axis under f is the vertical line x = log(7). This is because the positive real axis is defined by the points where y = 0, and the function f(x) = log(7) is equal to 0 when x = log(7).

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The linear equation of the given table as a function is expressed as: y = -4x + 3

The formula for the equation of a line from two coordinates is expressed as: (y - y₁)/(x - x₁) = (y₂ - y₁)/(x₂ - x₁)

Let us used the first two coordinates which are (0, 3) and (1, -1) to get:

(y - 3)/(x - 0) = (-1 - 3)/(1 - 0)

(y - 3)/x = -4

y - 3 = -4x

y = -4x + 3

Thus, we can conclude that the linear equation of the given table as a function is expressed as: y = -4x + 3

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The product of (0.00034) and 48579 is approximately 16.517 (rounded to three decimal places). Therefore, the correct answer is option c) 16.517.

In the first part, the calculation is performed by multiplying the given numbers: (0.00034) x 48579 = 16.51586.

In the second part, the answer is rounded properly to three decimal places, resulting in 16.517. This ensures that the reported answer matches the requested level of precision.

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A. Participants ranged in age from 4 to 90 (M = 26.24, SD = 23.00).

This option provides the correct range of ages, mean (M), and standard deviation (SD) in the correct APA format.

C. There were 45 men, 45 women, 2 nonbinary, and 2 who did not provide their gender.

This option provides the correct frequency information for gender, including the number of men, women, nonbinary individuals, and those who did not provide their gender.

The range, mean, and standard deviation are statistical measures used to describe a set of data.

Range: The range is the difference between the highest and lowest values in a dataset. It gives an indication of the spread or variability of the data.

Mean: The mean is the average of a set of values. It is calculated by summing up all the values and dividing by the number of data points. The mean represents the central tendency of the data.

Standard Deviation: The standard deviation measures the dispersion or variability of the data points around the mean. It quantifies the average amount of deviation or distance between each data point and the mean.

These measures provide important information about the data distribution, central tendency, and spread.

A. Participants ranged in age from 4 to 90 (M = 26.24, SD = 23.00).

This option provides the correct range of ages, mean (M), and standard deviation (SD) in the correct APA format.

C. There were 45 men, 45 women, 2 nonbinary, and 2 who did not provide their gender.

This option provides the correct frequency information for gender, including the number of men, women, nonbinary individuals, and those who did not provide their gender.

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In the final arrangement, Angela is to the left of Eric.

Given the initial arrangement of Joan, Emmanuel, Andrew, and Angela from left to right, we need to determine who is to the left of Eric after the swaps.

First, Janet changes places with Eric. So the new arrangement becomes:

Joan, Emmanuel, Andrew, Janet, Angela.

Next, Eric changes places with Marcus. Considering the updated arrangement:

Joan, Emmanuel, Andrew, Janet, Marcus, Angela.

Now, we need to identify who is to the left of Eric. Looking at the arrangement, we see that Marcus is to the left of Eric. Therefore, Marcus is the answer.

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The Tabular Cusum Method is used to monitor a process

where μ0, σ, K, and C-10 are 10, 2, 0.4, and 2.83242 respectively.

The problem is to find P(C-11 = 0).

Answer: For the Tabular Cusum Method, we need the following:

UCL = Kσ = 0.4 x 2 = 0.8CL = 0LCL = -Kσ = -0.8

The initial values for C+ and C- are zero.

If X is a random variable with mean μ and standard deviation σ, then we can use the following formula for C+ and C-:

(a) C+ = max [0, C+ (k - 1) - kσ + (X - μ + 0.5σ)]

(b) C- = max [0, C- (k - 1) - kσ - (X - μ + 0.5σ)]

where k and σ are constants, μ is the mean of the process and C+ and C- are the positive and negative cumulative sums, respectively.

We have k = 0.4 and σ = 2.

The mean of the process is μ0 = 10 and C-10 = 2.83242.

Therefore,

C+1 = max [0, 0 + 0.4 x 2 - 0.8 + (0 - 10 + 0.5 x 2)] = 0.

4C-1 = max [0, 2.83242 + 0.4 x 2 + 0.8 - (0 - 10 + 0.5 x 2)]

= 2.8324

2C+2= max [0, 0.4 + 0.4 x 2 - 0.8 + (0 - 10 + 0.5 x 2)]

= 0

C-2 = max [0, 2.83242 + 0.4 x 2 + 0 - (0 - 10 + 0.5 x 2)]

= 0

C+3 = max [0, 0 + 0.4 x 2 - 0 + (0 - 10 + 0.5 x 2)]

= 0.6

C-3 = max [0, 0 + 0.4 x 2 + 0 - (0 - 10 + 0.5 x 2)]

= 2.43242

C+4 = max [0, 0.6 + 0.4 x 2 - 0.8 + (0 - 10 + 0.5 x 2)]

= 0.2

C-4 = max [0, 2.43242 + 0.4 x 2 + 0.8 - (0 - 10 + 0.5 x 2)]

= 0

C+5 = max [0, 0.2 + 0.4 x 2 - 0 + (0 - 10 + 0.5 x 2)]

= 0.4

C-5 = max [0, 0 + 0.4 x 2 + 0 - (0 - 10 + 0.5 x 2)] = 2.03242

C+6 = max [0, 0.4 + 0.4 x 2 - 0.8 + (0 - 10 + 0.5 x 2)]

= 0

C-6 = max [0, 2.03242 + 0.4 x 2 + 0.8 - (0 - 10 + 0.5 x 2)]

= 0

Therefore,

P(C-11 = 0) = P(C+6 = 0)

= 0 (since C+6 is always positive).

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The probability that a randomly selected student who has the virus is from Ward C is approximately 0.43 or 43%.

(a) The probability that a randomly selected student from these three wards has the virus is calculated as follows:

Probability = {(Number of patients with virus in Ward A + Number of patients with virus in Ward B + Number of patients with virus in Ward C) / Total number of patients}

Total number of patients

= Number of patients in Ward A + Number of patients in Ward B + Number of patients in Ward C

= 35 + 70 + 50

= 155

Number of patients with virus in Ward A = 0.1 × 35

                                                                   = 3.5

                                                                   ≈ 4

Number of patients with virus in Ward B = 0.15 × 70

                                                                   = 10.5

                                                                    ≈ 11

Number of patients with virus in Ward C = 0.2 × 50

                                                                   = 10

Probability

= (Number of patients with virus in Ward A + Number of patients with virus in Ward B + Number of patients with virus in Ward C) / Total number of patients

= (4 + 11 + 10) / 155

≈ 0.2322 (correct to 4 decimal places)

Therefore, the probability that a randomly selected student from these three wards has the virus is approximately 0.2322 or 23.22% (rounded to the nearest hundredth percent).

(b) The probability that a randomly selected student who has the virus is from Ward C is calculated using Bayes' theorem,

Which states that the probability of an event A given that event B has occurred is given by:

P(A|B) = P(B|A) × P(A) / P(B)

where P(A) is the probability of event A,

P(B) is the probability of event B, and

P(B|A) is the conditional probability of event B given that event A has occurred.

In this case, event A is "the student is from Ward C" and event B is "the student has the virus".

We want to find P(A|B), the probability that the student is from Ward C given that they have the virus.

Using Bayes' theorem:P(A|B) = P(B|A) × P(A) / P(B)

where:P(B|A) = Probability that the student has the virus given that they are from Ward C = 0.2P(A)

                             = Probability that the student is from Ward C

                             = 50/155P(B)

                              = Probability that the student has the virus

                              = 0.2322

Substituting these values into Bayes'-theorem:

P(A|B) = P(B|A) × P(A) / P(B)

          = 0.2 × (50/155) / 0.2322

          ≈ 0.43 (correct to 2 decimal places)

Therefore, the probability that a randomly selected student who has the virus is from Ward C is approximately 0.43 or 43%.

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After rounding to one decimal place, the value of percent of decrease is,

⇒ P = 46.9%

We have to given that,

Sarah Walker's long-distance phone bills plummeted to an average of $25.50 a month from last year's monthly average of $48.10.

Hence, The value of percent of decrease is,

P = (48.10 - 25.5) / 48.1 x 100

P = (22.6/48.1) x 100

P = 0.469 x 100

P = 46.9%

Thus, After rounding to one decimal place, the value of percent of decrease is,

⇒ P = 46.9%

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The sample space describing all possible outcomes of tossing a coin three times is {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}, and the outcomes for the event that the first toss is tails are {THH, THT, TTH, TTT}.

In conclusion, the sample space for tossing a coin three times is {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}, and when the first toss is tails, the possible outcomes are {THH, THT, TTH, TTT}.

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A purchaser of a single ticket can anticipate losing, on average, $28.

The likelihood of winning each prize multiplied by the prize's worth, then adding up all the prizes, can be used to determine the estimated earnings for a single-ticket purchaser.

The big prize has a 1/9000 chance of being won, and it is worth $45000. Hence, the following are the anticipated profits from the main prize:

45000/9000 = 5

The odds of winning one of the three second-place prizes, each worth $9000, are 2/9000. The following is the anticipated profits from the second prize:

2/9000 * 9000 = 2

Finally, the price of the ticket itself is the projected cost of the ticket:

$35

Consequently, the difference between the expected value of the prizes and the ticket's price can be used to compute the expected wins for a single ticket purchaser:

$5 + $2- $35 = -$28

This indicates that a purchaser of a single ticket can anticipate losing, on average, $28.

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If µ = 30, σ = 5.2, X = 28.0, s = 6.1 and N = 13, the value of most powerful statistic to test significance of "sample-mean" is -1.39.

We calculate the value of most powerful statistic to test the significance of the sample-mean using the given values by the formula for the t-statistic:

t = (X - µ)/(σ/√N),

We know that : µ = 30, σ = 5.2, X = 28.0, s = 6.1, and N = 13;

Substituting these values,

We get,

t = (28 - 30)/(5.2/√13),

Simplifying this expression,

We get,

t = -1.3867 ≈ -1.39.

Therefore, the value of most powerful statistic is -1.39.

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The given question is incomplete, the complete question is

If µ = 30, σ = 5.2, X = 28.0, s = 6.1 and N = 13, the value of the most powerful statistic to test the significance of the sample mean is _________.

The answer, y(t) is given by y(t) = - 19/4 + 19/4 e-3t.

Given system of differential equations, da V = 0, dt dy + 3x + 4y = 0.dtTo write the system in matrix form, we have Let X = [x y]T then dX/dt = [dx/dt dy/dt] and equation (1) becomes dX/dt = [0; -3x-4y]Solving for eigenvalues of matrix A, we have A = [-3 4; 0 0]Characteristic polynomial of A: |λI - A| = (-λ)(-3-λ) = λ(λ+3)So, eigenvalues of A are λ1 = 0, λ2 = -3Solving for eigenvector corresponding to λ1 = 0, we have(A - λ1 I)X = 0=> A X = 0 => [-3 4; 0 0][x; y] = [0; 0]=> -3x+4y = 0=> y = (3/4) x Therefore, eigenvector corresponding to λ1 = 0 is [1; 3/4] Solving for eigenvector corresponding to λ2 = -3, we have(A - λ2 I)X = 0=> [-3+3 -4; 0 -3][x; y] = [0; 0]=> -x - 4y = 0=> y = (-1/4) x Therefore, eigenvector corresponding to λ2 = -3 is [1; -1/4] Now, putting the values of eigenvalues and eigenvectors in the given solution formula: X(t) = A1 e0t [1; 3/4] + A2 e-3t [1; -1/4]Then, X(t) = A1 [1; 3/4] + A2 e-3t [1; -1/4]Also, X(t) = [x(t); y(t)]Thus, x(t) = A1 + A2 e-3t and y(t) = (3/4) A1 - (1/4) A2 e-3tTherefore, particular solution satisfying initial conditions (0) = 3 and y(0) = -7 is x(t) = 10 - 10 e-3ty(t) = - 19/4 + 19/4 e-3t

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4, 16, 3 and 125 are the measures of the values A, B, C and D respectively.

If we have the logarithm expression below:

[tex]log_ab=c[/tex]

This can be transformed to indices form to have:

[tex]b=a^c[/tex]

Applying the rule above to the given question, we will have:

log₂ 16 = 4

2⁴ = 16

This shows that A = 4, B = 16

Similarly:

log₅125 = 3

This will be equivalent to 5³ = 125 where C = 3 and D = 125

The measure of values A, B, C and D are 4, 16, 3 and 125 respectively.

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The relation R on a set A is reflexive if ∀a∈A, aRa

The relation R on a set A is called symmetric if for all a,b∈A it holds that if aRb then bRa

The antisymmetric relation R can include both ordered pairs (a,b) and (b,a) if and only if a = b

The relation R on a set A is called transitive if for all a,b,c∈A it holds that if aRb and bRc, then aRc

a) The relation R is not reflexive:  (1, 1),(4,4)∉

relation R is not symmetric: (2,4)∈R,(4,2)∉R

relation R is not antisymmetric: (2,3),(3,2)∈

relation R is transitive: (2, 2),(2, 3) ∈R → (2,3)∈R;(2,2),(2,4)∈R→(2,4)∈R;

(2,3),(3,2)∈R→(2,2)∈R;(2,3),(3,3)∈R→(2,3)∈R;

(2,3),(3,4)∈R→(2,4)∈R;(3,2),(2,2)∈R→(3,2)∈R;

(3,2),(2,3)∈R→(3,3)∈R;(3,2),(2,4)∈R→(3,4)∈R;

(3,3),(3,2)∈R→(3,2)∈R;(3,3),(3,4)∈R→(3,4)∈R

b) Relation R is reflexive:  (1,1),(2,2),(3,3),(4,4)∈R

relation R is symmetric:  (1,2),(2,1)∈R

relation R is not antisymmetric: (1,2),(2,1)∈R

relation R is transitive: (1,1),(1,2)∈R→(1,2)∈R;(2,1),(1,2)∈R→(2,2)∈R;

(1,2),(2,1)∈R→(1,1)∈R;(1,2),(2,2)∈R→(1,2)∈R;

(2,2),(2,1)∈R→(2,1)∈R

c) Relation R is not reflexive: (1,1)∉R

relation R is symmetric:  (2,4),(4,2)∈R

relation R is not antisymmetric: (2,4),(4,2)∈R

relation R is not transitive: (2,4),(4,2)∈R,(2,2)∉R

d) Relation R is not reflexive: (1,1)∉R

relation R is not symmetric: (1,2)∈R,(2,1)∉R

relation R is antisymmetric: (2,1),(3,2),(4,3)∉R

relation R is not transitive: (1,2),(2,3)∈R,(1,3)∉R

e) The relation R is reflexive:  (1,1),(2,2),(3,3),(4,4)∈R

The relation R is symmetric: (1,1),(2,2),(3,3),(4,4)∈R

The relation R is antisymmetric: (1,1),(2,2),(3,3),(4,4)∈R

The relation R is transitive: we can satisfy (a, b) and (b, c) when a = b = c.

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The answer is the equation of the linear function represented by Table #2 is y = 4x + 6.

To determine which table contains (X, Y) values that were generated by a linear function, we need to check if the differences between consecutive Y-values are proportional to the differences between their corresponding X-values. If the differences are consistent and proportional, then the data points represent a linear function.

Let's examine each table:

Table #1:

X: 2 5 8 11 14 17 20 (given)

Y: 1 3 7 13 21 31 43 (given)

The differences between consecutive Y-values are:

2 - 1 = 1

7 - 3 = 4

13 - 7 = 6

21 - 13 = 8

31 - 21 = 10

43 - 31 = 12

The differences between consecutive X-values are all 3:

5 - 2 = 3

8 - 5 = 3

11 - 8 = 3

14 - 11 = 3

17 - 14 = 3

20 - 17 = 3

Since the differences between the Y-values are not consistent or proportional to the differences between the X-values, Table #1 does not represent a linear function.

Table #2:

X: 1 2 3 4 5 6 7 (given)

Y: 10 13 18 21 26 29 34 (given)

The differences between consecutive Y-values are:

13 - 10 = 3

18 - 13 = 5

21 - 18 = 3

26 - 21 = 5

29 - 26 = 3

34 - 29 = 5

The differences between consecutive X-values are all 1:

2 - 1 = 1

3 - 2 = 1

4 - 3 = 1

5 - 4 = 1

6 - 5 = 1

7 - 6 = 1

Since the differences between the Y-values are consistent and proportional to the differences between the X-values, Table #2 represents a linear function.

Now, let's determine the equation of the linear function represented by Table #2.

We can calculate the slope (m) using two points from the table. Let's find out-

(x1, y1) = (1, 10)

(x2, y2) = (7, 34)

The slope (m) is given by: m = (y2 - y1) / (x2 - x1)

= (34 - 10) / (7 - 1)

= 24 / 6

= 4

Using the point-slope form of the equation of a line: y - y1 = m(x - x1), we can choose either point (x1, y1) or (x2, y2) to substitute into the equation. Let's use (x1, y1) = (1, 10): y - 10 = 4(x - 1)

Simplifying the equation:

y - 10 = 4x - 4

y = 4x - 4 + 10

y = 4x + 6

Therefore, the equation of the linear function represented by Table #2 is y = 4x + 6.

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