{y: y is an integer and y ≥ 2}

Answers

Answer 1

Answer:

Step-by-step explanation:

i believe the total would be 4

Answer 2

Answer: The set of integers greater than or equal to 2 is {2, 3, 4, 5, ...}. This set can be represented using set notation as:

{y: y is an integer and y ≥ 2}

This set includes all the integers that are greater than or equal to 2, including 2 itself. It does not include negative integers or fractions.

For example, the following are all elements of this set:

2, 3, 4, 5, 6, 7, 8, ...

The following are not elements of this set:

-1, 0, 1, 1.5, -3.14, ...

This set is infinite, because there are an infinite number of integers greater than or equal to 2.


Related Questions

A party rental company has chairs and tables for rent l. The total cost to rent 5 chairs and 6 tables is $53. The total cost to rent 3 chairs and 2 tables is $21. What is the cost to rent each chair and each table?

Answers

For the given word problem, the cost to rent each chair is $5.25 and each table is $2.625

What is a word problem?

A word problem is a short passage presenting a "real-life" situation where an issue needs to be solved using math. The word problem for groups is a classic example, but there are numerous additional examples as well. This question is in many significant circumstances undecidable, which is a profound conclusion of computational theory.

Let C be the cost per chair

Let T be the cost per table

The total cost to rent 5 chairs and 6 tables is $53.

Then, 5C+6T=42 ................ (i)

The total cost to rent 3 chairs and 2 tables is $21.

Then, 3C+2T=21 ................. (ii)

Now, by solving both equations, multiply (ii) by 3 and subtract (i), we get

9C - 5C = 63 - 42

or, 4C = 21

or, C = $5.25

Then, T = (21-3*5.25)/2 = $2.625

Hence, the cost to rent each chair is $5.25 and each table is $2.625

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Which of the following are solutions to the equation |6x −1| = 17?
Select all that apply.

Answers

Answer: 3,-3  

Step-by-step explanation:

|6x-1| = 17

For absolute value problems there is always two solutions. They will both be the same number, one positive and one negative.

6x-1 = 17

Add 1 to both sides.

6x-1 +1 = 17+1

6x=18

Now, divide by 6.

6x/6=18/6

x = 3

The two answers that would be correct are 3,-3.

Someone needs to borrow $14,000 to buy a car and the person has determined that monthly payments of $250 are affordable. The bank offers a 4-year loan at 6% APR, a 5-year loan at 6.5%, or a 6-year loan at 7% APR. Which loan best meets the person's needs? Explain.

Which loan best meets the person's needs? (Round to the nearest cent)
A. The first loan best meets the person's needs because the monthly payment of $___ is less than the maximum budgeted amount of $250 per month.
B. The second loan best meets the person's needs because the monthly payment of $___ is less than the maximum budgeted amount of $250 per month.
C. The thirdloan best meets the person's needs because the monthly payment of $___ is less than the maximum budgeted amount of $250 per month.
D. None of the loans meet the person's needs.

Answers

Answer: 7% at 6 years would best fit their payment option. They would then be paying $238.69 monthly and which is under $250, I hope this helps!

Suppose you send aboui 12 text messaqes a day, and your older sister sends
more text messages than you do. Together, you send a total of about 26 messages per day. About how many text messages does she send a day? Write an equation and solve for the unknown value.

Answers

Answer:

Step-by-step explanation:

if you send 12 messages a day.

and your sister sends and unkown number of texts per day but together you both send 26 number of total texts.

Then, suppose your sister sends X number of texts.

Then

X + 12 = 26

X = 26 - 12

X = 14

Simplify each of the following expressions:
-5 + 2 + 8 =

Answers

Add 8+2

-5+10

Calculate

Solution is 5


Which of the relations given by the following sets of ordered pairs is a function?
O ((-2,5), (7, 5), (-4, 0), (3, 0), (1, — 6)}
O ((3, 3), (3, — 1), (3, 1), (3, 3), (3,5)}
O {(1, 2), (2, 3), (3, 4), (5, 6), (2, 1)}
O {(2,8), (1,-4), (0, 0), (1, 4), (2,8)}

Answers

Step-by-step explanation:

be a function, there needs to be one unique

value of +y+ for every +x+

-----------------------------

The 1st set has 5 different values of +y+

for +x+=+1+ and violates definition

--------------

The 2nd set is a function

-----------------------

The 3rd set has

( 1,2 ) & ( 1,1 )

( 2,3 ) & ( 2,2 )

( 3,4 ) & ( 3,3 )

Each of these pairs violates the definition

----------------

The 4th set has ( 2,-7 ) & ( 2,0 ) which

violate definition

Teddy has two piggy banks. The difference in the amount of money between the two banks is no more than $10. One piggy bank has $7.31 in it. Select the choices that make the inequality and statement about the possible amount of money in the other piggy bank correct.

Answers

The inequality and statement about the possible amount of money in the other piggy bank is 0 ≤ PB₂ ≤ 2.69.

What are inequalities and their types?

Inequality is a relation that compares two numbers or other mathematical expressions in an unequal way.

The symbol a < b indicates that a is smaller than b.

When a > b is used, it indicates that a is bigger than b.

a is less than or equal to b when a notation like a b.

a is bigger or equal value of an is indicated by the notation a b.

Given, Teddy has two piggy banks. The difference in the amount of money between the two banks is no more than $10.

∴ PB₁ + PB₂ ≤ 10.

One piggy bank has $7.31 in it.

∴ 7.31 + PB₂ ≤ 10.

PB₂ ≤ 2.69.

So, The amount in PB₂ can be  0 ≤ PB₂ ≤ 2.69.

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Need help making a frequency table

Answers

Here is the frequency table based on the data:

1 - 200                7

201 - 400            1

401 - 600            2

601 - 800            3

801 - 1000           1

1001 - 1200          1

1201 - 1400

1401 - 1600          1

1601 - 1800         1

What is a  frequency table ?

A  frequency table is a table that is used to compress a large dataset into a smaller format that can be easily interpreted. A  frequency table is usually made up of a class interval and frequency.

A class is the group of a numbers. The frequency of the class is the total number of times that numbers within the class appear in the dataset.  For example in the class 100 - 200, there are 7 numbers in the dataset that have a value between 100 and 200. This means that the frequency of 100-200 is 7.

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will mark brainliest to whoever is correct

Answers

I’d say D bc it makes the most sense to me, I hope it helps

Compare the square root of 26 and twenty eight sixths using >, <, or =.

twenty eight sixths is less than the square root of 26
the square root of 26 is less than twenty eight sixths
twenty eight sixths is greater than the square root of 26
the square root of 26 is equal to twenty eight sixths

Answers

The numbers, square root of 26 and twenty eight sixths can be compared using the known values of the square root of a number near to 26, such as 25, and inequality symbols, which indicates;

Twenty eight sixths is less than the square root of 26

What is an inequality in mathematics?

An inequality is a comparison between values that have different measures or magnitude, such that one values may be less than, <, greater than, >, or not equal to, ≠, the other value in the comparison.

The square root of 26 is √(26)

Twenty eight sixths is [tex]\dfrac{28}{6}[/tex]

26 is a larger number than 25, therefore;

√(26) > √(25) = 5

The square root of 26, is larger than 5; √(26) > 5

Expressing the fraction of twenty eight sixths as a proper fraction, indicates

[tex]\dfrac{28}{6} = 4\frac{4}{6} =4\frac{2}{3}[/tex]

Twenty eight sixths is four and two thirds, therefore;

Four and two thirds is less than 5, therefore;

[tex]4\frac{2}{3} < 5[/tex]

Substituting twenty eight sixths with four and two thirds, indicates;

[tex]\dfrac{28}{6} = 4\frac{2}{3} < \sqrt{26} > 5[/tex]

[tex]\dfrac{28}{6} = 4\frac{2}{3} < 5 < \sqrt{26}[/tex]

[tex]\dfrac{28}{6} < \sqrt{26}[/tex]

The correct option is therefore;

Twenty eight sixths is less than the square root of 26

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Divide
(-21yx+31y²x⁴) ÷ (-4y²x⁴)
Simplify your answer as much as possible

Answers

Solution:

Given:

(-28yx+ 31y²[tex]x^{4}[/tex])/(-4y²[tex]x^{4}[/tex])

[tex]\frac{-28yx}{-4y^{2}x^{4} }[/tex] + [tex]\frac{31y^{2}x^{4}}{-4y^{2} x^{4} }[/tex]

[tex]\frac{7}{x^{3} y}[/tex] + [tex]\frac{31}{4}[/tex]

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After dividing the given equation, the answer in the simplest form is [tex]\frac{7}{x^{3} y}- \frac{31}{4}[/tex]

What do you mean by simplest form?

A fraction with a denominator and numerator that are both relatively prime has the simplest form. It indicates that the fraction's numerator, which is the portion at the top of the fraction, and denominator, which is the portion at the bottom, do not share any factors other than one.

An amount that represents a fraction of a whole is called a fraction. A fraction's reduced form is another name for its simplest form. A fraction with a common factor of one, such as 34, has the simplest form. Although 2/4 can be further simplified and written as 12, it is not the most basic form. The fractions 12 and 2/4 are equivalent in this case, we can also say.

Given:

⇒(-28yx+ 31y²[tex]x^{4}[/tex])/(-4y²[tex]x^{4}[/tex])

⇒ [tex]\frac{-28yx}{-4x^{4}y^{2}}[/tex] + [tex]\frac{31y^{2}x^{4}}{-4y^{2} x^{4} }[/tex]

⇒     [tex]\frac{7} {x^{3} y}[/tex] - [tex]\frac{31}{4}[/tex]

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Ginny and Bob are both locksmiths.

Ginny uses the function f(x)=60x+80 to determine the charge to her customers, where x represents the number of hours of labor.

The table shows what Bob charges a customer for x hours of labor.

x (hours) 0 1 2 3 4
cost ($) 60 140 220 300 380
Which locksmith charges less for an initial fee for a service call?

Drag a value or name to the boxes to correctly complete the statements.

Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Ginny charges Response area for an initial fee, and Bob charges Response area for an initial fee. Response area charges less for an initial fee.

Answers

Ginny charges $80 for an initial fee, and Bob charges $60 for an initial fee.  Bob charges less for an initial fee.

What is a function?

A relation between a collection of inputs and outputs is known as a function. A function is, to put it simply, a relationship between inputs in which each input is connected to precisely one output. Each function has a range, codomain, and domain.

f(x)=60x+80 is function that represents the charge to Ginny's customers, where x represents the number of hours of labor.

To find initial fee, put x = 0 in the given function.

Put x = 0 in f(x) = 60x + 80:

f(0) = (60×0) + 80

f(0) = 80

The initial fee is $80.

From the table,

When x = 0, cost = $ 60.

The initial fee is $60.

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What shapes use the area formula A = lw ?
O Parallelogram
O Triangle
O Trapezoid
O Rectangle

Answers

Answer:

Rectangle

Step-by-step explanation:

Welcome to Brainly! :]

A rectangle uses A=lw to calculate area

Where l is length and w is width

Hope this helps,

:]

answer - rectangle

rectangles area formula is lw where l is length and w is width

Write and graph the inverse of y=-x²+9
Write the inverse of y=-x²+9
y=
(Simplify your answer. Use a comma to separate answers as needed.)

Answers

The inverse of y=-x²+9 is [tex]x=\sqrt{9-y}[/tex]

What is Inverse of a Function?

A function takes in values, applies specific operations to them, and produces an output. The inverse function acts, agrees with the outcome, and returns to the initial function.

The output of a function is returned by the inverse function, which also returns the initial value.

If f and g are inverse functions, then f(g(x)) = g(f(x)) = x. The initial value is fetched via a function that is its inverse.

For instance, f(x) = 2x + 5 = y

Therefore, the inverse of f is g(y) = (y-5)/2 = x. (x).

The relationship that results from swapping out an independent variable with a variable that depends on a given equation; the inverse may or may not be a function.

A function is said to be an inverse function if its own inverse is represented by the symbol f-1.

[tex]x^2=9-y\\\\\x=(9-y)^\frac{1}{2}\\\\ x=\sqrt{9-y}[/tex]  is the inverse of y=-x²+9

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a researcher is performing a two-way anova using two factors. the first factor has 4 levels and the second factor has 9 levels. in the anova summary table, the degrees of freedom for the interaction between the first and second factors will be 24 27 32 36

Answers

In a two-way ANOVA, the two independent variables are known as factors. Two variables, or factors, are supposed to influence the dependent variable.

First, let's understand what is 2-way ANOVA using 2 factors.

To determine how the values of two categorical factors affect the mean of a quantitative variable, a two-way ANOVA is utilized. When you wish to determine how two independent factors interact with one another to effect a dependent variable, use a two-way ANOVA.

To evaluate if there is a statistically significant difference between the means of three or more independent groups that have been divided on two factors, a two-way ANOVA is utilized.

Given is that the first factor has 4 levels and the second factor has 9 levels.

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I need help with my home work

Answers

The value of x is 9 and the value of y is 4.

What is the congruent triangle?

If all three corresponding sides and all three corresponding angles are equal in size, two triangles are said to be congruent. Slide, twist, flip, and turn these triangles to create an identical appearance. They are in alignment with one another when moved.

The HL Postulate states that if the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent.

The system of equations is

x + 3 = 3y ....(i)

x = y + 5 .....(ii)

Putting x = y + 5 in equation (i):

y + 5 + 3 = 3y

y + 8 = 3y

3y = y + 8

3y - y = 8

2y = 8

y = 4

Putting y = 4 in equation (ii)

x = 4 + 5 = 9

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Hi can you help me with this problem?and explain it to me thanks!
-
Euromart Tile Company borrowed $40,000 on April 6 for 66 days. The rate was 14% using the ordinary interest method. On day 25 of the loan, Euromart made a partial payment of $15,000, and on day 45 of the loan, Euromart made a second partial payment of $10,000.
a.
What was the new maturity value of the loan?
b. What was the maturity date of the loan?

Answers

Answer:

A. The new maturity value of the loan would be $15,000

B. The maturity data of the loan would be June 20

Step-by-step explanation:

N/A

Complete the inequalities for the domain and range of the solution set to equation below.
y=8 x-4
Where x is the number of days and y is the weight of the plant.

Answers

the domain =  [1,∞) and range = [4 , ∞) for the given equation.

What is domain and range?

The set of all doable values that qualify as inputs to a operate is understood because the domain of the operate, or it may also be outlined because the entire set of values doable for freelance variables.

The set of all the outputs of a operate is thought because the vary of the operate or when subbing the domain, the whole set of all values attainable as outcomes of the variable.

Main body:

Given equation =

y=8x-4

as x is the number of days

and,y is the weight of the plant.

so x can not be negative

hence the domain of x = [1,∞)

As x is positive , y can not be negative as well.

Hence the domain =  [1,∞) and range = [4 , ∞)

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4 divided by 5/9 wrote in simplest form need it by 12/2/22 -12/4/22

Answers

Answer:

Step-by-step explanation:

First write the reciprocal of 5/9 which it is 9/5 then multiply by 5 which it equal to 36/5

Stephen's current hourly pay is $10.30. If he receives a 4.5% hourly pay increase each year, what will his hourly pay be in two years?
$14.94
$11.25
$10.76
$15.00

Answers

Answer:

$11.25

Step-by-step explanation:

If Stephen receives a 4.5% hourly pay increase each year, his hourly pay will be $10.30 + (4.5% * $10.30) = $10.30 + $0.465 = $10.765 after the first year.

In the second year, his hourly pay will be $10.765 + (4.5% * $10.765) = $10.765 + $0.486 = $11.251.

Therefore, in two years, Stephen's hourly pay will be $11.251. This is closest to the answer choice of $11.25, so it is the correct answer.

Biologists stocked a lake with 800 fish and estimated the carrying capacity (the maximal population for the fish of that species in that lake) to be 6600 . The number of fish grew to 1020 in the first year.
a) Find a logistical model for the number of fish P(t) after t years
P(t)=
b) How long will it take for the population to increase to 3300 hhalf of the carrying capacity)?
It will take years.

Answers

Answer:

Below

Step-by-step explanation:

from 800 to 1020 is  a  220/800 * 100% = 27.5% increase each year

P(t) = 800 ( 1 + .275)^t    

3300 = 800 ( 1+.275)^t

3300 / 800  = 1.275 ^t     LOG both sides

.615423 / LOG 1.275 = t   = 5.83 years

The​ U-Drive Rent-A-Truck company plans to spend ​$16 million on 320 new vehicles. Each commercial van will cost ​$​25,000 each small truck ​$80,000​, and each large truck $70,000. Past experience shows that they need twice as many vans as small trucks. How many of each type of vehicle can they​ buy?

Answers

If each large truck $70,000. Past experience shows that they need twice as many vans as small trucks. The number of each type of vehicle they can buy is; Small truck 80, Commercial van 160, Large van 80.

How to find the number of vehicle?

Since the company intends to purchase 320 vehicle, Let write this equation:

C + S + L = 320 (Eq. 1)

Total cost of the vehicles:

25C + 80S +70L = 16,000 (Eq. 2)  (Divided by 1000 to keep the numbers small)

Number of commercial vans is twice the number of small trucks,

C = 2S

Substituting 2S in place of C in Eq. 1 and Eq. 2

2S + S + L = 320

25(2S) +80S +70L = 16,000

130S + 70L = 16,000

Multiplying the first of those equations by 70

210S + 70L = 22,400

130S + 70L = 16,000

Subtracting the second equation from the first:

80S = 6400

Divide both  side by 80S

S = 6400/80

S = 80 (Small truck)

Then:

C = 2S

C= 2(80)

C= 160 (Commercial van)

So,

C + S + L = 320

160 + 80 + L = 320

L = 320 - 160 - 80

L =80 (Large van)

Therefore  the number of each type of vehicle they can buy is; Small truck 80, Commercial van 160, Large van 80.

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The volume of a particular die is 7200 mm³. Use the fact that 10 mm equals 1 cm to convert this volume to cm³. Round your answer to the nearest tenth.​

Answers

Answer: 720.0 cm³

Step-by-step explanation:

To convert the volume of the die from millimeters to centimeters, we need to divide the volume by the conversion factor that relates millimeters to centimeters. Since 10 millimeters is equal to 1 centimeter, the conversion factor is 10.

To convert the volume to centimeters, we can divide it by the conversion factor:

7200 mm³ / 10 = 720 cm³

This means that the volume of the die is 720 cm³. Rounded to the nearest tenth, the volume of the die is 720.0 cm³.

In an analysis of variance with a between-groups population variance estimate of 30 and a within-groups estimate of 25, the F ratio is A) 25 / (30–25) = 5.00
B) (30–25) / 30 = 0.17 C) 25 / 30 = 0.83
D) 30 / 25 = 1.20

Answers

The F ratio is 1.2.

What is statistic?

The study of statistics focuses on gathering, organizing, organizing, analyzing, interpreting, and presenting data. It is customary to start with a statistical population or a statistical model to be researched when applying statistics to a scientific, industrial, or social problem.

30/25 = 1.2

In an ANOVA, this statistic is used in the F test to test the hypothesis that the group means are not equal to one another. The F ratio is calculated as follows:

Fobs=MSB/MSW

30/25 = 1.2

Where MSB is the mean square between the groups and MSW is the mean square within the groups.

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Example 2
3. FOOTBALL The flight of a football thrown by a quarterback can be
modeled by an interval of a function. Sketch a nonlinear graph that
shows the height of a football y, in feet, as a function of time x, in
seconds.
Positive: between 0 seconds and 5 seconds
Negative: for time greater than 5 seconds (represents time after
the ball hits the ground)
Increasing: for time less than 2 seconds
Decreasing: for time greater than 2 seconds
Relative Maximum: at 2 seconds, when the height of the football is 9 feet
Height of Football (ft)
End Behavior: As time increases, the height of the football decreases.
Symmetry: The height of the football for time between 0 seconds and 2 seconds
is the same as the height for time between 2 seconds and 4 seconds.

Answers

The quadratic function that models the path of the ball is given as follows:

y = -(x - 2)² + 9.

The graph of this quadratic function is given by the image shown at the end of the answer.

How to define the path of ball?

The ball is increasing, and then later it decreases, meaning that it is defined by a concave down quadratic function.

The ball has a positive height until 5 seconds, hence one of the roots of the quadratic function is of 5, that is, when x = 5, y = 0.

The vertex of the quadratic function is given as follows:

(2,9).

Hence the vertex form definition of the quadratic function is given as follows:

y = a(x - 2)² + 9.

When x = 5, y = 0, hence the leading coefficient a is obtained as follows:

0 = a(5 - 2)² + 9

9a = -9

a = -1.

Hence the quadratic function is given as follows:

y = -(x - 2)² + 9.

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What are the vertex and range of y = |4x + 8| − 1?

Answers

The vertex and range of y = |4x + 8| - 1 will be (-2, -1) ; -1 ≤ y < ∞ respectively. Using the concept of function -

What is function?

According to the function, every value in the domain is associated to exactly one value in the range, and they have a predetermined domain and range. This specific sort of connection is what it is called.

Given that,

y = |4x +8| - 1

To get the vertex of y = |4x +8| - 1 as follows.

Where the absolute values are zeros are the vertex points of the absolute value function.

or, |4x +8| = 0

or, 4x +8= 0

or, 4x = -8

or, x = -2

Substitute the value into an original function,

y = |4(-2) + 8| - 1

y= 0 - 1

y = - 1

As a result, the vertex is at (-2, -1)

Remember that the domain is specified in the range of (-∞, ∞) while determining the range.

Given that |4x + 8| ≥ 0 , (absolute value is always 0 or positive)

The result of adding -1 to the inequality's two sides is

|4x + 8| - 1 ≥ - 1

But since |4x + 8| - 1 is identical to f(x) = y, we have y = f(x) - 1, which means that the range is specified for all values larger than -1.

So the range is -1 ≤ y < ∞

Thus,the vertex and range of y = |4x + 8| - 1 will be (-2, -1) ; -1 ≤ y < ∞ respectively.

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5x +6 (x-2) -8 (x-3) please help

Answers

Answer:

3x + 12

Step-by-step explanation:

5x + 6(x - 2) - 8(x - 3) ← distribute parenthesis

= 5x + 6x - 12 - 8x + 24 ← collect like terms

==(5x + 6x - 8x) + (- 12 + 24)

= 3x + 12

PLSSSSSSSS HELP!!!!!!

Samuel currently has 18 rocks in his collection and gains 4 each week. Lewis currently has 30 rocks in his collection and gains 3 each week. Part A: Set up a system of equations to show how many rocks each has in their collection. You must write two equations for this. (2 points) Part B: After how many weeks will Samuel and Lewis have the same number of rocks in their collections? Write out the equation used and show all work. (1 point) Part C: How many rocks will Samuel and Lewis have when the amount of rocks in their collection is equal? Show work on how this is found. (1 point)

Answers

Answer:

Part A:

Samuel: y=4x+18

Lewis: y=3x+30

Part B: 12 weeks

Part C: 66 rocks

Step-by-step explanation:

Part A:

X represents the number of weeks. With the current amounts, you add that to the equation.

Part B/C:

1. Have both equations equal to each other

4x+18 = 3x+30

2. Solve for x

x = 12

3. Substitute the given variable, x, into the equation y=4x+18

y=4(12)+18

4. Solve for y

y=66

x=12

y=66

The height of a tower on a scale drawing is 14 centimeters. The scale is 2 cm : 13 m. What is the actual height of the tower?

Answers

Using the cross-multiplication method, we know that the actual height of the building is 91 m.

What is the cross-multiplication method?

One might cross-multiply an equation between two fractions or rational expressions in mathematics, more specifically in elementary arithmetic and elementary algebra, to make the equation simpler or to find the value of a variable.

To cross-multiply two fractions, multiply the first fraction's numerator by the second denominator and the second fraction's numerator by the first fraction's denominator.

So, we know that:

The height of the building scale is 14 cm.

The scale is 2 cm and the actual height is 13 m.

Now, the actual height of the building will be:

14/x = 2/13

Use cross-multiplication method as follows:

14/x = 2/13

2x = 14 * 13

2x = 182

x = 182/2

x = 91 m

Therefore, using the cross-multiplication method, we know that the actual height of the building is 91 m.

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X is a normally distributed random variable with mean 51 and standard deviation 13. What is the probability that X is between 38 and 90? Use the 0.68-0.95-0.997 rule and write your answer as a decimal. Round to the nearest thousandth if necessary.

Answers

Therefore, by using mean and standard deviation the required probability is P( 38 ≤ x ≤ 90) = P(-1<x<3) = 0.83999

In math, what is the mean?

The mean (also known as the arithmetic mean, as opposed to the geometric mean) of a dataset is the sum of all values divided by the total number of values. It's the most commonly used measure of central tendency and is often referred to as the "average.

What is a standard deviation?

A standard deviation (or) is a measure of how dispersed the data is in relation to the mean. A low standard deviation indicates that data are clustered around the mean, whereas a high standard deviation indicates that data are more spread out.

Given:

mean = μ = 51

Standard deviation = σ = 13

as per the question, the probability that X is between 38 and 90 will be

P( 38 ≤ x ≤ 90)

By using the 0.68 - 0.95 - 0.997 rule

P( 38 ≤ x ≤ 90) = P((x-μ)/σ≤z≤(x-μ)/σ)

P( 38 ≤ x ≤ 90) =P((38-51)/13≤z≤(90-51)/13)

from z standard normal table  

P(x<-1) = 0.15866

P(x>3) = 0.0013499

Therefore, by using mean and standard deviation the required probability is

P( 38 ≤ x ≤ 90) = P(-1<x<3) = 0.83999

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