Question: Let X be a random variable with the following probability distribution. Value x of X P(X-x) .30 0.05 -20 0.30 -10 0.35 0 0.15 10

Let X be a random variable with the following probability distribution. Value x of X P(X-x) .30 0.05 -20 0.30 -10 0.35 0 0.15 10 0.05 20 ' 0.10 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) =

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