1 . 已知随机变量
,
满足:
,
,且
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54400e19e54880e1d41545788094cb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600e2f07437fc2649b037b9802ffce04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff78b14836888641c133e1a2fcc4cf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f412feb8dcad5599ddfe1d1ceb00ac0b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-07-04更新
|
603次组卷
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4卷引用:浙江省金华市东阳市2020届高三下学期6月模拟考试数学试题
19-20高三上·浙江·阶段练习
名校
解题方法
2 . 已知离散型随机变量
的分布列为:
若
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75664f9140c2f891ea5c20c495b5cc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62dd66ffbcad36a5451cd1c61b44b760.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-08-19更新
|
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3卷引用:浙江省超级全能生2019-2020学年高三上学期9月联考数学试题(B卷)
(已下线)浙江省超级全能生2019-2020学年高三上学期9月联考数学试题(B卷)人教A版(2019) 选修第三册 核心素养 第七章 7.3.2 离散型随机变量的方差安徽省阜阳市临泉中学2021-2022学年高二下学期数学竞赛试题
3 . 随机变量X的取值为0,2,3,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ed164d4fc92409327981883ee68d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0b401fd2785b721df7a206ede37e97.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
解题方法
4 . 随机变量
的分布列如下:
其中
,
,
成等差数列,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
1 | 2 | 3 | |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a0722562d03a0a55a6c63e5d4cc338.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
5 . 已知样本数据
,
,…,
的方差为4,若由
,
,…,
得到另一组样本数据
,
,…,
,则样本数据
,
,…,
的方差为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e4c6544ede4573bd9a07d116f5cfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f215de40e551702840259a6162e0d50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0e5d304a970734699e275938d7136f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53a438f2d274adca7274b6e29af9880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffdea28b034c69ced5108b69a908c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffdea28b034c69ced5108b69a908c04.png)
A.8 | B.16 | C.32 | D.64 |
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2021-09-06更新
|
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4卷引用:浙江省金华市兰溪市第三中学2021-2022学年高二上学期开学考试数学试题
浙江省金华市兰溪市第三中学2021-2022学年高二上学期开学考试数学试题(已下线)4.2.4随机变量的数字特征-2021-2022学年高二数学同步知识梳理+考点精讲精练(人教B版2019选择性必修第二册)(已下线)专题26 统计-【重难点突破】2021-2022学年高一数学常考题专练(人教A版2019必修第二册)山东省青岛第一中学2022-2023学年高二上学期期初考试数学试题
6 . 已知随机变量的
的分布列为:
若E(
)=
,则x+y=__ ;D(
)=___
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
ξ | -1 | 0 | 2 |
P | x | ![]() | y |
若E(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
您最近一年使用:0次
7 . 已知随机变量
满足
,
,
.若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c9975b7cb327da8634aabab7856095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9c84082bd74cc1b4ff83c44d265944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd74add83d098d62539e2d8234e2d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef3ffa55d86d3aaa5189e2af27c7f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2994523edc11363c0a23dd9154fde9d6.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2020-04-27更新
|
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2卷引用:2019届浙江省衢州市衢州二中高三下学期高考适应性考试数学试题