10-24. Suppose a random variable X has a probability density function of the form f (x; λ) = -λe−λx, x ≥ 0,λ > 0;

0 elsewhere.

For X1, . . . ,Xn a random sample drawn from this exponential distribution, let T = ni

=1 Xi n be an estimator for λ. Find MSE(T, λ).