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f5. Suppose that N,X1,X2,... are independent r.v.'s with N equally likely to be 1 0r 2, and Xi N Exp(1/a). Let S' = 112;le (3)

\f5. Suppose that N,X1,X2,... are independent r.v.'s with N equally likely to be 1 0r 2, and Xi N Exp(1/a). Let S' = 112;le (3) Find E(S). (b) Find Var(3)

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