1 . 设随机变量
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e00839b5f46bfbd4843b919f2cfbdf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a0722562d03a0a55a6c63e5d4cc338.png)
A.1.2 | B.1.8 | C.2.4 | D.3.6 |
您最近一年使用:0次
2022-04-28更新
|
172次组卷
|
5卷引用:广东省深圳市龙岗区德琳学校2022-2023学年高二艺术班下学期期末数学试题
解题方法
2 . 若随机变量
满足
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870528aa6be6f56bae0eb6b10a765c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed881c86a152caaf5f476eab47f0b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e4d5be1a6c4ce408b4442935ca9ad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 已知随机变量
,那么随机变量
的均值
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360eb05f692c068e2e328a652b71ab2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次