題組內容
3. (35 points) Let X and Y have the joint p.d.f.
$$f(x, y) = \frac{1}{64} xy^2 \exp\left(\frac{-(x + y)}{2}\right), \quad 0 < x, y < \infty.$$
(b) Calculate Pr(X > 3).
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3. (35 points) Let X and Y have the joint p.d.f.
$$f(x, y) = \frac{1}{64} xy^2 \exp\left(\frac{-(x + y)}{2}\right), \quad 0 < x, y < \infty.$$
(b) Calculate Pr(X > 3).