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4 years ago

I just need to know 15 to 21

Mathematics

1 answer:

slega [8]4 years ago

3 0

The anwser is 6 because if 15 goes up 6, it becomes 21

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The following function is probability mass function. f left-parenthesis x right-parenthesis equals StartFraction 2x plus 1Over 2

lora16 [44]

Answer:

a) Mean = 2.6

B) Variance = 9.2

Step-by-step explanation:

We are given the following probability mass function in the question:

$F(x) = \dfrac{2x+1}{25}, x = 0,1,2,3,4$

a) Mean of random variable

$\mu = \displaystyle\sum x_iF(x_i)\\\\=0(\dfrac{1}{25}) + 1(\dfrac{2+1}{25}) + 2(\dfrac{4+1}{25}) + 3(\dfrac{6+1}{25}) + 4(\dfrac{8+1}{25})\\\\=\dfrac{3+10+21+36}{25} = \dfrac{70}{25} = 2.8$

b) Variance of the random variable

$\sigma^2 = \displaystyle\sum x_i^2F(x_i)\\\\=0^2(\dfrac{1}{25}) + 1^2(\dfrac{2+1}{25}) + 2^2(\dfrac{4+1}{25}) + 3^2(\dfrac{6+1}{25}) + 4^2(\dfrac{8+1}{25})\\\\=\dfrac{3+20+63+144}{25} = \dfrac{230}{25} = 9.2$

6 0

3 years ago

Help help help help help

Lostsunrise [7]

Answer:

Answer:set the amount of money merchant A:B:C

=A,B,C

A+B=3870

A+C=5775

B:C =4:9

A=2346

B=1524

C=3429

merchant A earn $2346

semoga membantu

8 0

3 years ago

A right rectangular pyramid is sliced vertically (down) by a plane passing

Anton [14]

A right rectangular pyramid when sliced vertically, the shape of the cross-section is known as Triangle.

<h3>What is A triangle?</h3>

This is known to be a kind of shape that is said to be in a closed form and it is also known to be a 2-dimensional shape that has 3 sides, 3 angles, and also 3 vertices.

Note that when the when the right rectangular pyramid is sliced vertically (down) by a plane passing through the of the pyramid, the new shape of the cross-section is a triangle.

See full question below

A right rectangular pyramid is sliced vertically (down) by a plane passing through the of the pyramid. What is the shape of the cross-section?

A. Rectangle

B. Pyramid

C. Triangle

D. Trapezoid

See full question below

Learn more about triangle from

brainly.com/question/17335144

#SPJ1

3 0

2 years ago

Mom has 1/2 cup of sprinkles to sprinkle on Brandon’s birthday cupcakes. She uses half of the sprinkles. How much does she use?

Nikitich [7]

Answer:

1/4 Cup

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Can anyone help I could really use it

slamgirl [31]

Answer:

-12m-6n

Step-by-step explanation:

Let's break this down systematically

Start:

8m + 2n - 4(5m - 2n)

Use the distributive property

8m + 2n - <u>4(5m - 2n)</u>

8m + 2n - 20m - 8n

Match like terms <em>m </em>and <em>n</em>

8m - 20m = -12m

2n - 8n = -6n

8 0

4 years ago