All categories

4 years ago

The following table shows the probability of rolling the numbers 1 through 7 on a fair seven-sided die.

1 answer:

4 0

E(X) = 1/7 + 2(1/7) + 3(1/7) + 4(1/7) + 5(1/7) + 6(1/7) + 7(1/7) = 1/7 + 2/7 + 3/7 + 4/7 + 5/7 + 6/7 + 7/7 = 24/7 = 4.

Var(X) = 1/7(1 - 4)^2 + 1/7(2 - 4)^2 + 1/7(3 - 4)^2 + 1/7(4 - 4)^2 + 1/7(5 - 4)^2 + 1/7(6 - 4)^2 + 1/7(7 - 4)^2 = 9(1/7) + 4(1/7) + 1/7 + 1/7 + 4(1/7) + 9(1/7) = 9/7 + 4/7 + 2/7 + 4/7 + 9/7 = 28/7 = 4

standard deviation = sqrt(Var(X)) = sqrt(4) = 2.

You might be interested in

Find the Volume of the cone

Karolina [17]

Answer:

Step-by-step explanation:

first we need to know that redious isn't gien

so we have to find redious

according to Pythagoras theorem

a²+b²=c²

a=√c²-b²

a=17²-15²

a=√(17+15)(17-15)

a=√64

a=8

$as \: we \: khow \: volume \: of \: a \: cone$

$= \frac{1}{3} \pi {r}^{2} h$

$\frac{1}{3} \pi \times {8}^{2} \times 15$

$\frac{\pi}{3} \times 64 \times 15$

$\pi \times 64 \times 5$

$3.141 \times 64 \times 5$

$1005.12$

7 0

3 years ago

17 20 13 5 30 13 6 15 median

fiasKO [112]

The median is 14.......

5 0

3 years ago

1. A roller coaster is based all on: *

VLD [36.1K]

D, A, B, A, D, B, A, C

6 0

3 years ago

Find the product. 1.68×2.5 =?

Maslowich

Answer:

1.68x2.5=4.2

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Who shall help meh today?

Wittaler [7]

Answer:

If I am correct they should all go to across each other because if you think about it they all lead to the explanation be asked for hope this helped and hopefully is correct

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers