5. Let X1,...,x. be a random sample from the exponential distribution with rate 1/8, where the density is 1 S(r) for x > 0. Let @ = X and , =nX/(n + 1). Consider the squared error loss, (a) Evaluate the risk functions of , and @, (as estimators of ). (b) Set the prior distribution of 6 to be exponential with rate 0.5. Find the Bayes risk of 6