Question: Letbe a random variable with the following probability distribution. Valueof x of X / P(X=x) -30 / 0.10 -20 / 0.35 -10 / 0.20 0

Letbe a random variable with the following probability distribution.

Valueof x of X / P(X=x)

-30 / 0.10

-20 / 0.35

-10 / 0.20

0 / 0.30

10 / 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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