Question: Letbe a random variable with the following probability distribution. Valueof x of X / P(X=x) 3 / 0.25 4 / 0.15 5 / 0.15 6

Letbe a random variable with the following probability distribution.

Valueof x of X / P(X=x)

3 / 0.25

4 / 0.15

5 / 0.15

6 / 0.10

7 / 0.30

8 / 0.05

Complete the following. (If necessary, consult a list of formulas.)

(a) Find the expectationof E (X) of X.

E(X) = _______

(b) Find the variance Var (X) of X.

Var(X)=________

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