Let X₁,X₂, . . .,X_n be a random sample from a Poisson distribution with mean μ. Thus, Y = Σⁿ_i=1 X_i has a Poisson distribution with mean nμ. Moreover, ‾X = Y/n is approximately N(μ, μ/n) for large n. Show that u(Y/n) =Y/n is a function of Y/n whose variance is essentially free of μ.