probability distribution

Let X be a random variable with the following probability distribution. Value x of X P(X=x) 10 0.10 20 0.45 30 0.35 40 0.10 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E( X) = 1 (b) Find the variance Var(X ) of X. Var (X) =1 I Don't Know Submit Type here to search O