Question: Please answer a and b below. Let X be a random variable with the following probability distribution. Value x of X P ( X=x) 30

Please answer a and b below.

Let X be a random variable with the following probability distribution. Value x of X P ( X=x) 30 0.25 40 0.30 50 0.05 60 0.05 70 0.05 80 0.30 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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