解题方法
1 . 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
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
4 . 设随机变量
服从二项分布
,且
,则
,
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e543992e9a80da766c53d16cbe48c020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ea2965347e2d087b4885a272d16a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
您最近一年使用:0次
2016-11-30更新
|
1111次组卷
|
5卷引用:广东省珠海一中09-10学年高二下学期期末考试理科数学试题
(已下线)广东省珠海一中09-10学年高二下学期期末考试理科数学试题新疆沙雅县第二中学2018-2019学年高二下学期期中考试数学(理)试题专题11.3 概率分布与数学期望、方差(讲)-江苏版《2020年高考一轮复习讲练测》人教A版(2019) 选修第三册 核心素养 第七章 7.4.1 二项分布(已下线)专题2二项分布运算(基础版)