五、(10%) Let $f(x; \theta) = (1/\theta^2)xe^{-x/\theta}$, where $x > 0$ and $\theta > 0$. Let $X1, X2, \dots, X_n$ denote a random sample of size $n$ for this distribution. What is the maximum likelihood estimator of $\theta$. (Please show the details)

相關申論題

相關試卷