Let X be a random variable with the following probability distribution. Value x of X P(X=x)...

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Let X be a random variable with the following probability distribution. Value x of X P(X=x) -20 0.10 -10 0.05 0 0.15 10 0.35 20 20 0.05 30 0.30 (a) Find the expectation E (X) of X. E (X) = (b) Find the variance Var(X) of X. Var(X) = Let X be a random variable with the following probability distribution. Value x of X P(X=x) -20 0.10 -10 0.05 0 0.15 10 0.35 20 20 0.05 30 0.30 (a) Find the expectation E (X) of X. E (X) = (b) Find the variance Var(X) of X. Var(X) =