Question: Suppose E ( X ) = 5 E [ X ( X - 1)] = 27.5 What is a. E ( X 2 )=? [

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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