We have seen that if E(X1) E(X2) . . . E(Xn) , then

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We have seen that if E(X1)  E(X2)  . . .  E(Xn)  , then E(X1 . . . Xn)  n. In some applications, the number of Xis under consideration is not a fixed number n but instead is an rv N. For example, let N  the number of components that are brought into a repair shop on a particular day, and let Xi denote the repair shop time for the ith component. Then the

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