3. (25pts) Let X1, ..., Xn be a random sample from a distribution with density function f(x; 0) = -x20 e-"/, for r > 0. One can show that E(X) = 30, V(X) = 302. (a) (15pts) Show that the Cramer Rao lower bound is (b) (10pts) Is the estimator 0 = 1 2. X, MVUE? Justify your