題組內容

1. Let X and Y be two random variables with the joint probability density function $$f(x, y) = 2(x + y), \quad 0 \leq x \leq y \leq 1$$

(b) \( (10\%) \) Let \( W = \ln \left(\frac{Y}{X}\right) \). Find the probability density function of \( W \).