名校
解题方法
1 . 设随机变量
,且
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183cd913199e4beb18867a6fd46b0a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77415d0c85af86fd94fc429c032912ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86055a4b5630ee8debb2abe45cdc0d79.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-05-04更新
|
423次组卷
|
3卷引用:广东省广雅中学2019-2020学年高二下学期4月线上测试数学试题
2 . 已知随机变量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897f09c3a0ba87805ee07f03f12af040.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897f09c3a0ba87805ee07f03f12af040.png)
A.9 | B.6 | C.4 | D.3 |
您最近一年使用:0次
2019-10-12更新
|
1264次组卷
|
6卷引用:广东省江门市2018-2019学年高二上学期期末数学试题
解题方法
3 . 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