2. (10%) Let $X_1, X_2, \cdots, X_n$ be a random sample from the distribution with a probability density function
$f(x; \theta) = \theta_1 e^{-\theta_1(x - \theta_2)}, x > 0; \theta_1 > 0; \theta_1 \in R.$
2. (10%) Let $X_1, X_2, \cdots, X_n$ be a random sample from the distribution with a probability density function
$f(x; \theta) = \theta_1 e^{-\theta_1(x - \theta_2)}, x > 0; \theta_1 > 0; \theta_1 \in R.$