name the following polyhedra:​

Name The Following Polyhedra:

Answers

Answer 1

a. The polyhedron is a triangular prism

b. The polyhedron a pentagonal pyramid

Determining the names of the polyhedra

From the question, we are to determine the names of the given polyhedra.

a. The given polyhedra is a three-dimensional geometric shape that consists of two congruent parallel triangles as the base and three rectangular faces that connect the corresponding sides of the triangles.

This shape is known as a triangular prism.

b. The polyhedra is a three-dimensional geometric shape that consists of a pentagonal base and five triangular faces (also known as lateral faces) that meet at a common vertex point above the base. The lateral faces connect the corners of the pentagonal base to the apex, forming five triangular sides that taper upwards to meet at a single point.

This shape is known as a pentagonal pyramid.

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Related Questions

Edie bertelli received her statement

Answers

The average daily balance is 163.904.

Given that Edie Bertelli received her statement from a department store.

A) The average daily balance =

sum of daily balance / no. of days = 4917.12/30 = 163.904.

B) Finance charges =  

average daily balance x period rate = 163.904 x 1.20% = 1.966%

C) New balance =

(Opening balance + finance charge + new purchase) - payment =

(175 + 1.966 + 55.94) - 90 = 142.9068

Hence, the average daily balance, the finance charges and the new balance is 163.904, 1.966 and 142.908 respectively.

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there are how many distinct website graphics to be created?

Answers

According to the question there are 35 distinct website graphics that can be created by using at least four of seven different bitmap images.

What is website?

A website is a collection of related web pages, images, videos, and other digital assets that are hosted on a web server and can be accessed by users over the internet. A website is typically identified by a unique domain name and can be accessed by typing the URL into a web browser.

Using the formula for calculating the number of combinations of size k from a set of size n (n choose k), we can calculate the number of distinct website graphics that can be created by using at least four of seven different bitmap images as follows:

n = 7 (7 different bitmap images)
k = 4 (at least 4 of the 7 bitmap images)
Number of distinct website graphics = (7 choose 4) = 35
Therefore, there are 35 distinct website graphics that can be created by using at least four of seven different bitmap images.

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Find the value of x, y, and z, in the rhombus below.
x=
-2z+8
5y-4
y =
2=
46
-2x+6

Answers

Answer:

x = 3

y = 23

z = 4

Step-by-step explanation:

To find the values of x, y, and z in the rhombus, we need to use the properties of a rhombus. One of the properties of a rhombus is that its opposite angles are equal. Another property is that its diagonals are perpendicular bisectors of each other.

Let's label the vertices of the rhombus as A, B, C, and D, and the midpoint of diagonal AC as M. We can use the given information to write some equations:

First, we know that diagonal AC is perpendicular to diagonal BD, so we have:

-2x + 6 = 0

Solving for x, we get:

x = 3

Next, we know that diagonal AC bisects angle ACD, so we have:

y = 46/2 = 23

Now, we can use the fact that AM is the perpendicular bisector of CD to find z. Since M is the midpoint of AC, we have:

AM = MC

Using the distance formula, we can find the lengths of AM and MC in terms of z:

AM = sqrt((2z-8)^2 + (5y-4)^2)

MC = sqrt((8-2z)^2 + (5y-4)^2)

Setting these two expressions equal to each other, we get:

sqrt((2z-8)^2 + (5y-4)^2) = sqrt((8-2z)^2 + (5y-4)^2)

Simplifying this equation, we get:

4z - 16 = 16 - 4z

8z = 32

z = 4

Therefore, the values of x, y, and z are:

x = 3

y = 23

z = 4

So, the solution is x=3, y=23, and z=4.

answer the linear equation

Answers

Answer:

The graphs of these lines intersect at

(0, 3).

place the indicated product in the proper location on the grid (b^2+8)(b^2-8)​

Answers

The final product of the given algebraic expression is: b⁴ - 64

How to expand algebraic expressions?

Algebraic expressions are defined as simply the idea of expression of numbers using letters without specifying their actual values. The basics of algebra taught us how to express an unknown value using letters such as a, b, c, etc. These letters are referred to as variables. An algebraic expression can be a combination of both the variables and the constants. Any value that is placed before and multiplied by a variable is a coefficient.

The expression is given as:

(b² + 8)(b² - 8)

Expand the expression using (a + b)(a - b) = a² - b²

Thus:

(b² + 8)(b² - 8) = b⁴ - 64

Thus, that is the final product of the given algebraic expression.

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7-1 Additional Practice
1. A random selection will be made from a bug containing different
colored disks. Of the 25 disks in the bag, 5 are yellow,
30 P(yellow)
a. The probability that a yellow disk will be selected is Ois 2


How come the answer is 2?

Answers

based on the information provided, the probability of selecting a yellow disk is 1/5 or 0.2.

How to solve the problem?

The probability of selecting a yellow disk cannot be 2, as probabilities must always be between 0 and 1.

To calculate the probability of selecting a yellow disk, we can use the formula:

P(yellow) = number of yellow disks / total number of disks

From the information given, we know that there are 5 yellow disks and 25 total disks in the bag. Plugging these values into the formula gives:

P(yellow) = 5/25 = 1/5

Therefore, the probability of selecting a yellow disk is 1/5 or 0.2, which is a decimal value between 0 and 1.

It's possible that there was a typo in the original question or answer, or that some other context is missing which would make sense of the answer being 2. However, based on the information provided, the probability of selecting a yellow disk is 1/5 or 0.2.

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CAN SOMEONE HELP WITH THIS QUESTION?

Answers

a. From the graph a = 1 and b = 1

b. f(x) = -x/4 + 5

c. The area under the graph is 9 units²

How to find the area under the graph?

a. First to find the area under the graph, we find the values of a and b. From the graph, a = 1 and b = 3

b. To find f(x), we note that f(x) is a straight line. So, using the equation of a

in slope form, we have that

(y - y')/(x - x') = (y" - y')/(x" - x') where

x' = 0, x" = 4, y' = 5 and y" = 4.

So, substituting the values of the variables into the equation, we have that

(y - y')/(x - x') = (y" - y')/(x" - x')

(y - 5)/(x - 0) = (4 - 5)/(4 - 0)

(y - 5)/x = -1/4

y - 5 = -x/4

y = -x/4 + 5

So, f(x) = -x/4 + 5

c. To find the area under the curve, we notice that ∫f(x)dx = area

So, ∫f(x)dx = ∫₁³(-x/4 + 5)dx

= ∫₁³(-xdx/4) +  ∫₁³5dx

= [-x²/(2 × 4)]₁³ + [5x]₁³

= [-x²/8]₁³ + [5x]₁³

= [-3²/8 - (-1)³/8] + 5[3 - 1]

= [-9/8 + 1/8] + 5[2]

= -8/8 + 10

= -1 + 10

= 9 units²

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Find the value of x in this problem

Answers

Answer: The value of x will be equal to 5.

Step-by-step explanation:

1. Since all the angles of the given triangle is equal it proves to be an Equilateral Triangle.

2. Now as all the angles are equal the length of side will be equal too.

3. Equating both equations: 3x-3 = 2x+2

3x-2x = 3+2 => x = 5.

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A company manufacturing oil seals wants to establish and R control charts on the process. There are 25 preliminary samples of size 4 on the internal diameter of the seal. The summary data (in mm) are as follows:
∑ =1,253.75, ∑=14.08.
(1) Find the control limits that should be used on the and R control charts.
(2) Assume that the 25 preliminary samples plot in control on both charts. Estimate the process mean and standard deviation.

Answers

(1) To find the control limits for the x-bar and R charts, we first need to calculate the center line and the standard deviation of the sample means and ranges.

The center line for the x-bar chart is:
CLx-bar = (∑x) / (n * k) = 1,253.75 / (4 * 25) = 7.92

The center line for the R chart is:
CL(R) = (∑R) / (n * k) = 14.08 / (4 * 25) = 0.14

The standard deviation of the sample means is:
σx-bar = R / d2 = 0.14 / 1.023 = 0.1366

The standard deviation of the sample ranges is:
σR = D4 * R-bar = 2.282 * 0.14 = 0.319

The upper and lower control limits for the x-bar chart are:
UCLx-bar = CLx-bar + A2 * σx-bar = 7.92 + 0.577 * 0.1366 = 7.999
LCLx-bar = CLx-bar - A2 * σx-bar = 7.92 - 0.577 * 0.1366 = 7.840

The upper and lower control limits for the R chart are:
UCLR = D3 * R = 0 * 0.14 = 0
LCLR = D3 * R = 0 * 0.14 = 0

(2) Assuming that the 25 preliminary samples plot in control on both charts, we can estimate the process mean and standard deviation using the x-bar chart. The center line of the x-bar chart is the estimate of the process mean, which is 7.92. The standard deviation of the sample means is the estimate of the process standard deviation, which is 0.1366.

Find the x-intercept and the y-intercept 7x-3y=21

Answers

y-int= -7 , x-int= 3
y-intercept:

Plug in 0 for 'x' to find the y-intercept:

[tex]7x - 3y = 21[/tex]

[tex]7(0) - 3y = 21[/tex]

[tex]0 - 3y = 21[/tex]

[tex]-3y = 21[/tex]

Divide -3 to both sides:

[tex]y = -7[/tex]

So the y-intercept is -7.

x-intercept:

[tex]7x - 3y = 21[/tex]

Plug in 0 for 'y' to find the x-intercept.

[tex]7x - 3(0) = 21[/tex]

[tex]7x - 0 = 21[/tex]

[tex]7x = 21[/tex]

Divide 7 to both sides:

[tex]x = 3[/tex]

So the x-intercept is 3.

What is the volume of the rectangular prism?

A rectangular prism where the area of the base is 24 square inches and the height is 6 inches.

150 in.3
144 in.3
132 in.3
120 in.3

Answers

The volume of the rectangular prism is 144 in³ with the area of the base is 24 square inches and the height is 6 inches.

What is volume?

Volume is a measure of the amount of physical space occupied by an object or a fluid.

This is because the volume of a rectangular prism can be calculated by the formula V = A x h, where V is the volume, A is the area of the base, and h is the height. In this problem, the area of the base is 24 square inches and the height is 6 inches.

Therefore, the volume of the rectangular prism can be calculated as follows:

V = 24 in² x 6 in

= 144 in³

It is important to note that the formula for calculating the volume of a rectangular prism can be used for any rectangular prism, regardless of the size of the area of the base and the height. The formula remains the same and the only thing that changes is the numbers that are used to calculate the volume.

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If tan (theta) = A, sin(theta)= B, then:
a. sin(-theta)=
C. cos(theta + 2pie) =
b. tan(-theta)=
d. tan(theta + pie)=

Answers

The answer of the given question based on the trigonometric identities is , A. sin(-Θ) = -B , b. tan(-Θ) = -A , C. cos(Θ + 2π) = B/√(A² + B²) , D. tan(Θ + π) = -A.

Trigonometric identities: what are they?

Trigonometric identities are equations in mathematics that use trigonometric functions and hold true regardless of the value of the variables. These identities can be applied to simplify or alter trigonometric expressions, as well as to trigonometric function-based equations.

To determine the required values, we can utilise sine and tangent definitions along with trigonometric identities:

a. sin(-Θ) = -sin(Θ) = -B (using the property that sine is an odd function)

b. tan(-Θ) = -tan(Θ) = -A (using the property that tangent is an odd function)

c. cos(Θ + 2π) = cos(Θ) = B/√(A² + B²) (using the Pythagorean identity, since cos²(Θ) + sin²(Θ) = 1)

d. tan(Θ + π) = (tan(Θ) + tan(π))/(1 - tan(Θ)tan(π) = (-A + 0)/(1 + A0) = -A

Therefore, the values are:

a. sin(-Θ) = -B

b. tan(-Θ) = -A

c. cos(Θ + 2π) = B/√(A² + B²)

d. tan(Θ + π) = -A

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The complete question is:

If tan (θ) = A, sin(θ)= B,

Then find the following:

a. sin(-θ)=

b. tan(-θ)=

c. cos(θ+ 2π) =

d. tan(θ+ π)=

The answer of the given question based on the trigonometric identities is , A. sin(-Θ) = -B , b. tan(-Θ) = -A , C. cos(Θ + 2π) = B/√(A² + B²) , D. tan(Θ + π) = -A.

Trigonometric identities: what are they?

Trigonometric identities are equations in mathematics that use trigonometric functions and hold true regardless of the value of the variables. These identities can be applied to simplify or alter trigonometric expressions, as well as to trigonometric function-based equations.

To determine the required values, we can utilise sine and tangent definitions along with trigonometric identities:

a. sin(-Θ) = -sin(Θ) = -B (using the property that sine is an odd function)

b. tan(-Θ) = -tan(Θ) = -A (using the property that tangent is an odd function)

c. cos(Θ + 2π) = cos(Θ) = B/√(A² + B²) (using the Pythagorean identity, since cos²(Θ) + sin²(Θ) = 1)

d. tan(Θ + π) = (tan(Θ) + tan(π))/(1 - tan(Θ)tan(π) = (-A + 0)/(1 + A0) = -A

Therefore, the values are:

a. sin(-Θ) = -B

b. tan(-Θ) = -A

c. cos(Θ + 2π) = B/√(A² + B²)

d. tan(Θ + π) = -A

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The complete question is:

If tan (θ) = A, sin(θ)= B,

Then find the following:

a. sin(-θ)=

b. tan(-θ)=

c. cos(θ+ 2π) =

d. tan(θ+ π)=

A sofa is being sold for 65% off the regular price . the sale price is $247 what is the regular price?

Answers

Answer:

$705.71

Step-by-step explanation:

Let's assume the regular price of the sofa is "x".

According to the problem statement, the sale price is 65% off the regular price, which means the sale price is equal to 35% of the regular price.

We can write this relationship as:

0.35x = $247

To find the value of "x", we need to solve for "x" in the above equation.

Dividing both sides by 0.35, we get:

x = $247 ÷ 0.35

x = $705.71

Therefore, the regular price of the sofa is $705.71.

13.5 ft2 = _______ yd2

Answers

Answer:

4.5

Step-by-step explanation:

uh

Solve the following proportion for x. x/13= 5/17 round your answer to the nearest tenth. x=

Answers

Answer:

x = [tex]\frac{65}{17}[/tex]

Step-by-step explanation:

[tex]\frac{x}{13}[/tex] = [tex]\frac{5}{17}[/tex] ( cross- multiply )

17x = 13 × 5 = 65 ( divide both sides by 17 )

x = [tex]\frac{65}{17}[/tex] ≈ 3.8 ( to the nearest tenth )

A union of restaurant and foodservice workers would like to estimate the mean hourly wage, u, of foodservice workers in the U.S. The union will choose a random sample of wages and then estimate u using the mean of the sample. What is the minimum sample size needed in order for the union to be 90% confident that its estimate is within $0.45 of u? Suppose that the standard deviation of wages of foodservice workers in the U.S. is about $2.20.

Answers

Union will need to choose a random sample of at least 65 wages to be 90% confident that its estimate of the mean hourly wage of foodservice workers is within $0.45 of the true population mean.

What is the minimum sample size needed?

To calculate the minimum sample size needed for the union to be 90% confident within $0.45 of the true population mean, we can use the formula which states n = (Z^2 * σ^2) / E^2

Z = 90% = 1.645

σ = $2.20

E = $0.45

Substituting the values, we get:

n = (1.645^2 * 2.20^2) / 0.45^2

n = 13.097161 / 0.2025

n = 64.6773382716

n = 64.678

n = 65

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I need help pleaseeee I’m confused on all if anyone out there could help please do!!!

Answers

Answer:

Hilltop

Step-by-step explanation:

Convert all to meters,

Mammoth- 8005 meters

Brookside- 8700 meters

Wild Rose- 8080 meters

Hilltop- 8800 meters.

Hilltop has the most meters, it is the longest.

A man bought a car for $8200 and sold it for 80% of the price two years later. How much did he lose? (PLEASE ANSWER FAST!!)

Answers

He lost $1640. Take $8200x.8 which = 6560 which is what he sold it for, so subtract $8200-$6560 = $1640.

Given ABCD is a parallelogram. Diagonals line segment AC and line segment BD intersect at E. Prove line segment AC is congruent to line segment of CE and line segment BE is congruent line segment DE

Answers

Answer: check explanation

Step-by-step explanation:

Since ABCD is a parallelogram, its opposite sides are parallel and congruent. Therefore, we have:

AB || CD and AB ≅ CD

AD || BC and AD ≅ BC

Since AC is a diagonal, it divides the parallelogram into two congruent triangles, namely, ΔABC and ΔACD. Therefore, we have:

∠A ≅ ∠D (corresponding angles of congruent triangles)

∠C ≅ ∠B (corresponding angles of congruent triangles)

AB ≅ CD (opposite sides of parallelogram)

AC ≅ AC (reflexive property of congruence)

Now, consider the triangles ΔAEC and ΔCEB. We have:

∠AEC ≅ ∠CEB (vertical angles)

∠ACE ≅ ∠BCE (corresponding angles of congruent triangles ΔABC and ΔACD)

AC ≅ AC (reflexive property of congruence)

Therefore, by the angle-angle-side (AAS) postulate, we can conclude that ΔAEC ≅ ΔCEB. Hence, we have:

CE ≅ AC (corresponding parts of congruent triangles)

BE ≅ DE (corresponding parts of congruent triangles)

Thus, we have proven that line segment AC is congruent to line segment CE, and line segment BE is congruent to line segment DE.

Need help with questions 3, 5, and 6.

Answers

Answer:

1. 16

2. 9

3. 21.08

Step-by-step explanation:

1. (explanation) (x+b)^2 = x^2+2bx + b^2 ( square formula)

16, would make a square trinomial

Answer:

1.16

2.9

3.x=9+root of 146(12.08) or x=9-root of 146

Solve the equation by completing the square. The equation has real number solutions.
x² + 12x = -32
X=

Answers

Answer:

X = -8 X= -4

Step-by-step explanation:

x² + 12x = -32

(x + 12/2)² = -32 + (12/2)²

(x + 6)²= 4

square root both sides

x + 6 = 2

x + 6 = -2

x=-8 x=-4

b) Draw a vertical y-axis on the left-hand side of your graph and label it. Then draw a horizontal x-axis at the bottom of your graph. Then label the coordinates of each corner of the sign on your graph. Draw line a on your graph. What is the slope of line a?

Answers

The line an illustrates a linear function. Line a's slope is thus 1. Y = x + 2 is the equation for the line 'a'.

What is a slope of line?

The steepness or slant of a line may be determined by looking at its slope. The slope is defined as the ratio of any two points on the line's vertical change (rise) to its horizontal change (run). The letter "m" is typically used to indicate slope.

The slope of a line connecting the coordinates (x1, y1) and (x2, y2) may be determined mathematically using the following formula:

[tex]m=\frac{y_{2}-y_{1} }{x_{2} -x_{1} }[/tex]

Now, Evaluating slope of line 'a';

[tex]m=\frac{4-2 }{2-0 } = \frac{2}{2} =1[/tex]

Hence, the slope of line 'a' is 1.

Final Plotted Graph is mentioned in image 3 attached.

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Complete Question : Draw a vertical y-axis on the left-hand side of your graph and label it. Then draw a horizontal x-axis at the bottom of your graph. Then label the coordinates of each corner of the sign on your graph(Refer to image attached). Draw line a on your graph. What is the slope of line a?

marking as brainlist!!! pls help

Answers

The measure of the angle ∠6 is 102 degrees for the given parallel lines.

What are supplementary angles?

Two angles are said to be supplementary if their sums equal 180 degrees. In other words, if angles A and B are complementary, then the sum of the two angles is 180 degrees. Four angles are created when two lines intersect; if two of these angles are supplementary, the other two are likewise supplementary.

Since 70 + 110 = 180 degrees, 70 degrees and 110 degrees serve as an illustration of a pair of supplementary angles. Another illustration is a pair of vertical angles, which are always supplementary and are generated by the intersection of two lines.

The measure of angle of a straight line is given as 180 degrees.

Thus,

∠6 + 78 = 180

∠6 = 180 - 78

∠6 = 102

Hence, the measure of the angle ∠6 is 102 degrees for the given parallel lines.

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x − 5 y = −5
−4x − 2 y = 20

Use Cramer's Rule to solve each system

Answers

Answer:

x = 6.111... and y = 1.

Step-by-step explanation:

To use Cramer's Rule, we first write the system of equations in matrix form, where the coefficients of x and y are placed in a matrix, and the constant terms are placed in a separate matrix. We then calculate the determinant of the coefficient matrix, which is the number that is obtained by multiplying the diagonal elements and subtracting the product of the off-diagonal elements.

Next, we replace the first column of the coefficient matrix with the constant terms and calculate the determinant of the resulting matrix. We do the same thing for the second column of the coefficient matrix. We then use Cramer's Rule to solve for x and y, which involves dividing the determinant of the matrix obtained by replacing the column of x coefficients with the constant terms by the determinant of the coefficient matrix to get the value of x. We do the same thing to find the value of y by dividing the determinant of the matrix obtained by replacing the column of y coefficients with the constant terms by the determinant of the coefficient matrix.

In the case of the given system of equations, the determinant of the coefficient matrix is 18. We then calculate the determinants of the matrices formed by replacing the first column of the coefficient matrix with the constant terms and the second column of the coefficient matrix with the constant terms. Using these determinants, we apply Cramer's Rule to find the values of x and y, which are x = 6.111... and y = 1.

Which matrix represents the system of equations shown below?
4x - 5y = 4
5x-2y=-16
A
4x -5y 4
5x -2y-16
B
4 -5 4
16] [1 46] [4
5 -2-16
C
D
541 5 4 4
][
-5-2-16-2-5-16

Answers

Answer:

it's for sure d please mark me as a brainliest

Sarah runs a small business employing 12 members of staff. Each of Sarah's employees works from 08:30 - 17:00 Sarah pays her workers £8.75 per hour. Calculate Sarah's daily outgoings on wages.

Answers

Sarah's daily outgoings on wages are £892.50.

What is wages?

Wages refer to the payment made to an employee in exchange for their labor or services provided to an employer. It is usually paid on an hourly, daily, weekly or monthly basis, and the amount of wages earned is determined by the hours worked, rate of pay, and any applicable deductions or taxes. Wages can be paid for various types of work, such as manual labor, skilled trades, clerical work, or professional services. It is an essential component of an employee's compensation package and is regulated by labor laws to ensure that employees are fairly compensated for their work.

Each employee works for 8.5 hours a day (17:00 - 08:30 = 8.5). So, the total number of hours worked by 12 employees in a day is 12 employees × 8.5 hours/employee = 102 total hours

Sarah pays each employee £8.75 per hour, so her total daily outgoings on wages can be calculated as,

102 total hours × £8.75 per hour/employee = £892.50

Therefore, Sarah's daily outgoings on wages are £892.50.

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How would you express the Raptors’ wins to games played as a ratio?
Soccer season = 35 games
Raptors: Played 10, Won 6

Answers

Answer:

3:5 or 3 to 5 or [tex]\frac{3}{5}[/tex]

Step-by-step explanation:

[tex]\frac{6}{10}[/tex] ÷[tex]\frac{2}{2}[/tex] = [tex]\frac{3}{5}[/tex]

Helping in the name of Jesus.

I'm not sure if I'm right for the answer for 4% so can anyone help pls.

I got 0% but I'm pretty sure that's wrong.

I got 8500 for 2%

Answers

Rachel $8500 invested at 4% and $8800 invested at 2% interest rate.

Define the term Investment?

Investment is the act of allocating money or resources with the expectation of generating income or profit in the future.

Let x be the amount invested in the second account (with a 4% interest rate).

Then, since Rachel invested $300 more in the first account, the amount invested in the first account (with a 2% interest rate) is (x + 300)

We know that the total interest income Rachel earned was $516. We can set up an equation using the interest formula: (2% means 0.02 and 4% means 0.04)

⇒ 0.02(x + 300) + 0.04x = 516
⇒ 0.02x + 6 + 0.04x = 516
⇒ 0.06x + 6 = 516
⇒ 0.06x = 510
⇒ x = 8500

So, Rachel invested $8500 in the second account (with a 4% interest rate)

and (x + 300) = (8500 + 300) = $8800 in the first account (with a 2% interest rate).

Therefore, Rachel $8500 invested at 4% and $8800 invested at 2%.

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A desk is being sold for $129.60. This is a 76% discount from the original price. What is the original price?

Answers

Answer:

170.52

Step-by-step explanation:

Let x be the original price

Then,

129.60 = 76% of x

129.60 = 76/100 * x

12960/76 = x

x = 170.52

Assume that 1,500,000 people take the SAT each year and their scores form a normal distribution. If Mike scores two standard deviations above the mean, what percentile is he?

Answers

If Mike scores two standard deviations above the mean then the Mike's percentile-score is 97.72 ≈ 98 percentile.

What is the percentile score.

The percentile score corresponding to a raw test score, is the probability of the test score of a randomly chosen student to be less than or equal to the given test score.  To calculate this probability we find the value of the cumulative distribution function of the test score random variable at the given test score.

How do we calculate the percentile score in the case when, the test scores  have a normal distribution.

To calculate the percentile score of the given raw test score we have to find the value of the cumulative distribution function for the test score random variable at the given raw test score. if this random variable is X, then the linearly scaled random variable [tex]Z=\frac{X-\mu}{\sigma}[/tex], has standard normal-distribution. here [tex]\mu\textrm{ and }\sigma[/tex] are the mean and the standard deviation of the test score r.v respc. Also [tex]\textrm{P}(X\leq x_0) = \textrm{P}(Z\leq z_0),\textrm{ where }z_0=\frac{x_0-\mu}{\sigma}[/tex].  So instead of finding [tex]\textrm{P}(X\leq x_0)\textrm{, we can find } \textrm{P}(Z\leq z_0)[/tex] instead. [tex]z_0[/tex] is called the z-score corresponding to the [tex]x_0[/tex]. We can find [tex]\textrm{P}(Z < z_0)[/tex], using the table for the standard normal distribution.

For our question, we want to find [tex]\textrm{P}(X\leq \mu + 2\sigma)[/tex]. which is equal to [tex]\textrm{P}(Z\leq \frac{\mu+2\sigma - \mu}{\sigma}) = \textrm{P}(Z\leq 2).[/tex] So the z-score = 2. From the table for the standard normal distribution we get [tex]\textrm{P}(Z\leq 2) = .9772[/tex]. So our percentile score is .9772 or 97.72% [tex]\sim[/tex] 98%.

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