Question: Let X be a random variable with the following probability distribution. Value x of X P ( X=x) -30 0.10 -20 0.50 -10 0.05 0

Let X be a random variable with the following probability distribution. Value x of X P ( X=x) -30 0.10 -20 0.50 -10 0.05 0 0.05 10 0.30 Complete the following. (If necessary, consult a list of formulas. ) (a) Find the expectation E (X) of X. E (X) = 1 (b) Find the variance Var(X ) of X. Var(x) = 0

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