设随机变量X的概率分布为P{X＝1}一P{X一2}＝
【正确答案】正确答案：Fz(z)＝P{Z≤z)＝P{XY≤z} ＝P{X＝1}P{XY≤z|X＝I}＋P{X＝2}P{XY≤z|X＝2} ＝P{x一1}P{Y≤z|X＝1}＋P{x＝2}P{Y≤
|X＝2}
|X＝2}【答案解析】
|X＝2}