Question 2 of 12 (5 points) | Question Attempt: 1 of 1 Let X be a random variable with the following probability distribution. Value x of X P (X=x) 10 0.10 20 0.35 30 0.40 40 0.10 50 0.05 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X ) of X. E(X) = I X ? (b) Find the variance Var(X ) of X. Var (X) =