名校
解题方法
1 . 已知
是离散型随机变量,且
,
,令
,则
、
分别是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b389244d0057fbbc946b107bd72be9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacfe4e47458e5544fa15f8f00812a42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b262198125153ac15e4e07e1f0a0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71701db4b413f2364dbcbd612fbc8a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f7c67b0bb498d3fa09bcdcec985b26.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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