Q1.

Let X be a random variable with the following probability distribution. Value x of X P( X=x) -30 0.05 -20 0.20 -10 0.15 0 0.20 10 0.25 20 0.15 Complete the following. (If necessary, consult a list of formulas. ) (a) Find the expectation E (X) of X. E(X) = 0 (b) Find the variance Var(X) of X. Var(X) = 0Let X be a random variable with the following probability distribution. Value x of X P(X=x) 20 0.10 30 0.30 40 0.20 50 0.05 60 0.35 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E(X) = 0 (b) Find the variance Var(X) of X. Var(X) = 0