5. Let X1, X2, ..., Xn denote a random sample from a gamma distribution, I(1, 1/0). The pdf of random variable Xi is f(xi; 0) = 0 exp{-20}. a) What is mle, 0, of parameter 0? Is the mle, 0, an unbiased estimator of 0? b) What is the CRLB for 0? c) What is the limiting distribution of 0? d) Is mle o an efficient estimator of 0