Let X1...Xn be a random sample from a Poisson distribution with mean . Let has a Poisson distribution with mean . is approximately for large n. Show that u(Y/n) = is a function of Y/n whose variance is free of

(c1 = cn)

(c2 = 2c1)

If c2 = 1, then

Is this correct, or have I made a mistake somewhere?