Expectation and variance of a random variable Let X be a random variable with the following probability distribution. Value x of X P(X=x) 40 0.30 50 0.10 60 0.20 70 0.15 80 0.25 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) – I Explanation Check

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