Let X be a random variable with the following probability distribution. Value x of X P (X=x) 20 0.10 30 0.05 40 0.70 0.15 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E (x) = ] %3D (b) Find the variance Var(X) of X. Var(x) = ] 50

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