Mathematics High School

find the expected value of a random variable with the following probability distribution :
2
3
4
5
6
7
8
9
10
11
12
———
1/36
1/18
1/12
1/9
5/36
1/6
5/36
1/9
1/12
1/18
1/36

Find The Expected Value Of A Random Variable With The Following Probability Distribution :234567891011121/361/181/121/95/361/65/361/91/121/181/36

Answers

Answer 1

Answer:

7

Step-by-step explanation:

correct with acellus

Answer 2

The expected value of a random variable with the following probability distribution will be 7.

How to calculate the expectation of a discrete random variable?

Expectation can be taken as a weighted mean, weights being the probability of occurrence of that specific observation.

Thus, if the random variable is X, and its probability mass function is given being  f(x) = P(X = x), then we have:

[tex]E(X) = \sum_{i=1}^n( f(x_i) \times x_i)[/tex]

[tex]\rm E(X)=2 \times \frac{1}{36} +3 \times \frac{1}{28} +4 \times \frac{1}{12} +5 \times \frac{1}{9} +6 \times \frac{5}{36} + 7 \times \frac{1}{6} +8 \times \frac{5}{36}+9 \times \frac{1}{9} +10 \times \frac{1}{12} +11 \times \frac{1}{18} +12 \times \frac{1}{36} \\\\ E(X)=7[/tex]

Hence the expected value of a random variable will be 7.

To learn more about the expected value refer to the link:

https://brainly.com/question/4515179

Related Questions

what is the answer to question 2

Answers

Answer:

The 3rd one, they followed animal migrations to get food

Find the sum of the interior angles of a regular 14-gon.

Answers

9514 1404 393

Answer:

  2160°

Step-by-step explanation:

The sum of interior angles of a convex n-gon is ...

  angle sum = 180(n -2)°

When n=14, the angle sum is ...

  angle sum = 180(14 -2)° = 2160°

I need help right now, because this is due tomorrow!!!​

Answers

Answer:

1.

mean 13.8 / median 14.5

2.

25.86 / 25

3.

14.43 / 15

4.  

4.875 / 4.5

5.

5.78 / 6

6.

34.11 / 34

7.

28.29 / 28

8.

14.43 / 14

Please Giiive Brillianst!!!!!!!!!!!

Solve for x: 2 over 3 (x − 2) = 4x. (1 point) negative 2 over 5 negative 5 over 2 2 over 5 5

Answers

-2/5

solve
distribute
subtract 4x from both sides
simplify
multiply
simplify
add 4 to both sides
simplify
divide both sides
simplify

15h - 4 = 6
Two step problem

Answers

Answer:

h = 10/15

Step-by-step explanation:

Isolate the variable, h. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS is the order of operation, and stands for:

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction

First, add 4 to both sides of the equation:

15h - 4 (+4) = 6 (+4)

15h = 6 + 4

15h = 10

Next, divide 15 from both sides of the equation:

(15h)/15 = (10)/15

h = 10/15 or 0.667 (rounded)

What type of function is this:

a1 = 2

an = an-1+4

Arithmetic and Explicit
Arithmetic and Recursive
Geometric and Explicit
Geometric and Recursive

Answers

Answer:

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.

[tex] \\ [/tex]

Joy is giving ice cream cones to some children at a carnival. She has 8 chocolate ice cream cones, 10 vanilla ice cream cones, and 6 strawberry ice cream cones. If Joy selects an ice cream cone randomly without looking, what is the probability that she will give a chocolate ice cream cone to the first child and then a vanilla ice cream cone to the second child? (1 point)

a.) 8 over 24 plus 10 over 24 is equal to 18 over 24
b.) 8 over 24 plus 10 over 23 is equal to 424 over 552
c.) 8 over 24 multiplied by 10 over 23 is equal to 80 over 552
d.) 8 over 24 multiplied by 10 over 24 is equal to 80 over 576

Answers

Answer:

so there will be 8 over 24 for the chocolate ice cream cones and since one cone was taken out, the denominator for the next fraction probability would be 23 and there are 10 vanilla ice cream cones so 10/23 so 8 over 24 * 10 over 23 So its not A and D the correct one is C

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

What's the volume of the prism?

Answers

Answer:

36

Step-by-step explanation:

Isn’t it 36^3 I think hope this helps

please could u help me with this?​

Answers

43.68. You multiply the base by the height

PLEASE HELP MEEEEEEE

Answers

Answer:

False

Step-by-step explanation:

Well we can try this by putting it into the equation

4(-1)+3(5)=1

4*-1=-4

3*5=15

-4+15=1 This statement is false, -4+15 actually equals 11

Sketch a graph of the solutions to your equation.

Answers

What is the equation? What is the solution?

Brainliest for correct! y varies inversely with x.

Answers

Answer:

i need help to

Step-by-step explanation:

lol

answer
20
explanation
when y is 10 x is 3 so if you were to double x to 6 you’d double y to 20

hope this helps and have a wonderful day :)

A baseball field has four bases that form the shape of a quadrilateral. If someone invented a new game similar to baseball that had four extra bases in the field, what type of polygon would the bases form?
A. pentagon
B. octagon
C. hexagon
D. decagon

Answers

Answer
C
Explanation

what is the sum of (5m+9)+(9b-3)+(8c+6) simplified

Answers

5m+9b+8c+12.....i think ? lolz

find the missing side

Answers

Answer:

15

Step-by-step explanation:

trust me

Classify this expression based on the number of terms: 4a^2+9ab^2-15b^3. A.Monomial B.Binomial C.Trinomial D.Polynomial

Answers

It is a trinomial because it has 3 terms.

Question 10
A pair of sneakers is originally priced at
$125. They are on sale for $75. What is
the percent discount?


-please show your work

Answers

Answer: 40% discount

Step-by-step explanation:

First lets find the difference between original price and sale price so $125-$75= $50

So we get a discount of 50 dollars off the original price

Next lets find out how much of %$125 is that $50 so [tex]\frac{50}{125}[/tex] as a decimal is .4 or 40%. To check our work lets multiply 125 by 0.4 so 125*0.4= 50 which is the discount.

Someone help and please make sure it’s right :)

Answers

Answer:

8

Step-by-step explanation:

120/15=8. :)

Answer:

8

Step-by-step explanation:

15x = 120° (exterior Alternate angles)

x = 120/8

x = 8

You have a 10% coupon for your favorite restaurant. You order $75 worth of food and drinks. What will your bill be (before tax) after the 10% discount?

Answers

Answer: $67.50

Step-by-step explanation:

2 (3x - 5) + 4 = -18


Solve for 20 Points

Answers

Answer:

x = -2

Step-by-step explanation:

2(3x - 5) + 4 = -18

Distribute the 2

6x - 10 + 4 = -18

6x - 6 = -18

Add 6 to both sides

6x = -12

Divide both sides by 6

x = -2

Check:

2(3x - 5) + 4 = -18

substitute x = -2 into the original equation

2(3(-2) - 5) + 4 = -18

2(-6 - 5) + 4 = -18

2(-11) + 4 = -18

-22 + 4 = -18

-18 = -18

So x = -2 is true.

Answer:

x=-2

Step-by-step explanation:

2(3x-5)+4=-18

We move all terms to the left:

2(3x-5)+4-(-18)=0

We add all the numbers together, and all the variables

2(3x-5)+22=0

We multiply parentheses

6x-10+22=0

We add all the numbers together, and all the variables

6x+12=0

We move all terms containing x to the left, all other terms to the right

6x=-12

x=-12/6

x=-2

2. In Ella's math class, there are 12 girls and 15 boys. Which of the following is the ratio of boys to girls in Ella's math class?
A 12/27
B 12/15
C15/12
D27/12​

Answers

Answer:

C. 15/12

Step-by-step explanation:

15 boys and 12 girls

Answer:

b

Step-by-step explanation:

12/15

Hiiioo! Can someone please help me with this math question ❤️

Answers

Answer:

your answers will be

<E=25

M<F=65

M<G=90

Step-by-step explanation:

i hope it helps

have a nice day!!

HELLLLPP I NEED HELP

Answers

Answer:

5x^2-5

Step-by-step explanation:

Answer:

it it 5x^2-5

Step-by-step explanation:

Please help :) i will give brainliest for correct

Answers

ANSWER - Number Five - Yep
Number Six - NO!!!!!!!!

Which value for w makes the equation TRUE? − 8 w + 2 = 3
A. -1/2
B. -1/8
C. 8
D. 9

Answers

Answer:

B. -1/8

Step-by-step explanation:

A. -8(-1/2) + 2 = 6 (incorrect answer)

B. -8(-1/8) +2 = 3 (correct answer)

C. -8(8) + 2 = -62 (incorrect answer)

D. -8(9) + 2 = -70 (incorrect answer)

I hope this helps :)

Mr. Gutierrez and his brother like to play video games. They want to purchase a game console that is $300, 4 games and 2 controllers. Write an expression to represent this situation.

Answers

Answer:

[tex]2x+y=150[/tex]

Step-by-step explanation:

Number of games = 4

Number of controllers = 2

Mr. Gutierrez and his brother want to purchase a game console that is $300.

Let [tex]x[/tex] denotes number of games and [tex]y[/tex] denotes number of controllers.

[tex]4x+2y=300[/tex]

Divide this equation by [tex]2[/tex]

[tex]2x+y=150[/tex]  

So, the expression to represent the situation is [tex]2x+y=150[/tex]

Solve the following system

y=1.6x
2x + 2y = 86

Answers

Answer:

The answer is (16.538461(repeated), 26.461538(repeated))

Answer:

x=16.538462 and y=26.461538

Select 3 side lengths that can form a right triangle.

Answers

Answer:

16 inches, 63 inches, and 65 inches

Step-by-step explanation:

Edit: I had to change cause it was wrong

Answer:

16 inches, 63 inches, and 65 inches

Step-by-step explanation:

16 squared = 256

63 squared = 3969

16 squared + 63 squared = 4225

65 squared = 4225

A^2 +B^2 = C^2

SOMEBODY HELP!!! will give brainliest

Answers

1. Slope: 2/3 Y-Intercept: (0,4)
2. Slope: -4 Y-Intercept: (0,-3)

a can do.a piece of work in 6 days and B in 8 days each working 7hours a day In what time will they finish it together, working 8hrs a day

Answers

A can complete the work in 7*6 hrs = 42 hrs. A can complete in 1 hr = 1/42 part. B can complete the work in 7*8 hr = 56 hrs. A&B together do in 1 hr = 1/42 + 1/56 = 7/168 = 1/24 part. So they will do in 8 hrs = 8*1/24 = 1/3 part. Hence they need 1÷1/3 = 3 days to complete the work.

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