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解题方法
1 . 随机变量
的分布列如下表,随机变量
.
(1)求
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600e2f07437fc2649b037b9802ffce04.png)
![]() | 0 | 1 |
![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71701db4b413f2364dbcbd612fbc8a67.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f7c67b0bb498d3fa09bcdcec985b26.png)
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![]() | 0 | 1 |
![]() | ![]() | ![]() |