Suppose E(X) = 5 E[X(X - 1)] = 27.5 What is
a. E(X2)? [Hint: E[X(X - 1)] = E[X2 - X] = E(X2) - E(X)]?
b. V(X)?
c. The general relationship among the quantities E(X), E[X(X - 1)], and V(X)?
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