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Let X1,..., Xn and Yi,..., Ym be two independent samples from a Poisson dis- tribution with parameter X. Let a, b be two posi

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Let X, X.. Xom and Y. 7. Im ~P(d) Then E(X) = E(Y) = 2 & ij. Y + 2 + tlm het i = a X, + X 2 + + xn n m 1 W E()) = 2 E(X + X 2

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