Let X be a random variable with the following probability distribution. Value x of X P( X=x) -2 0.75 -1 0.15 0 0.05 1 0.05 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X ) of X. E(X) = 1 X 5 ? (b) Find the variance Var(X ) of X. Var(X) = 1