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Suppose E(X) = 3 and E[X(X- 1)] = 25.5. \text { (a) What is } E\left(X^{2}\right) \text { ? [Hint: First verify that } E[X(X-1)]=E\left[X^{2}-X\right]=E\left(X^{2}\right)-E(X) \text { .] } \text

{ (b) What is } V(X) ?

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