Question: Please answer a and b Let X be a random variable with the following probability distribution Value x of X P ( X=x) 40 0.25

Please answer a and b

Let X be a random variable with the following probability distribution Value x of X P ( X=x) 40 0.25 50 0.30 60 0.40 70 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) =1

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