Let X be a random variable with the following probability distribution. Value x of X P(X=x) -20 0.30 -10 0.15 0.30 10 0.20 20 0.05 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E (X) = [] (b) Find the variance Var(X) of X. Var (X) = ]

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