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Q22Section A (Section A)22 of 60

Variance of an exponential-normal sum

Suppose that random variable XX has Exp(15)\mathrm{Exp}\bigl(\frac15\bigr) distribution and, for any x>0x>0, the conditional distribution of random variable YY, given X=xX=x, is N(x,2)N(x,2). Then Var(X+Y)\mathrm{Var}(X+Y) is equal to

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