Let X be a random variable with the following probability distribution. Value x of X 3 4 5 6 7 P X= x 0.05 0.35 0.25 0.05 0.30 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E (X) = 0 (b) Find the variance Var(X) of X. Var(x) = 0

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