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Let X be a random variable with the following probability distribution. Value X of X P(X=x) 0.10 0.30 2 0.30 3 0.20 4 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) = 1