1 . 若随机变量
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7c107a333878f02ad0104386868b8d.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a5d1267138c1696537eb5b6b778063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7c107a333878f02ad0104386868b8d.png)
您最近一年使用:0次
2021-08-26更新
|
342次组卷
|
5卷引用:山东省临沂市兰山区、兰陵县2020-2021学年高二下学期期中 数学试题
山东省临沂市兰山区、兰陵县2020-2021学年高二下学期期中 数学试题山东省临沂市兰陵县第四中学2020-2021学年高二下学期期中数学试题2023版 北师大版(2019) 选修第一册 突围者 第六章 全章综合检测2023版 北师大版(2019) 选修第一册 突围者 第六章 全章综合检测(已下线)随机变量及其分布章末检测卷(一)-【帮课堂】2022-2023学年高二数学同步精品讲义(人教A版2019选择性必修第三册)
解题方法
2 . 已知随机变量
的分布列为:
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b060ce5275f54932abc24547f579c1af.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
1 | 2 | 3 | |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667df0f959f5626681d6d9aecaf05be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b060ce5275f54932abc24547f579c1af.png)
您最近一年使用:0次
解题方法
3 . 设随机变量
满足
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0010cb466163db1349fc1040f6b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292d6c5909e3733722021487f221dea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a59f21e55021a165af4e5fad7e127c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a874feda9583d7ebbcad739022db93f1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 已知随机变量
满足
,则
的值等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d140336ab76ad823a5f5bf168d834631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2bbd900b33a011a15d22f72a0ea205.png)
A.20 | B.18 | C.8 | D.6 |
您最近一年使用:0次
5 . 若随机变量
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127a35ea7eb57fb1fc7815b2ae18e8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed7ec41bb9980ced2974b702ae50d3c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
6 . 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 |
您最近一年使用:0次
2021-09-06更新
|
258次组卷
|
4卷引用: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
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)
7 . 随机变量
,
满足:
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a874feda9583d7ebbcad739022db93f1.png)
![](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/df93deb126de1f4a75439807f526f2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8c79923a39bdef7000df4410a1be67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de6447558d0c50549ad3e27915c8d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a874feda9583d7ebbcad739022db93f1.png)
A.5 | B.4 | C.7 | D.9 |
您最近一年使用:0次
8 . 下列关于正态分布
的命题:
①正态曲线关于
轴对称;
②当
一定时,
越大,正态曲线越“矮胖”,
越小,正态曲线越“瘦高”;
③设随机变量
,则
的值等于2;
④当
一定时,正态曲线的位置由
确定,随着
的变化曲线沿
轴平移.
其中正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c4103c301ec02a9eccb481b006d6a0.png)
①正态曲线关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
③设随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed605f290b686aef31badb5af77b2262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc89470201487dc4111749d2f9fe03bd.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
其中正确的是
A.①② | B.③④ | C.②④ | D.①④ |
您最近一年使用:0次
9 . 已知随机变量
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9e1303531dd6e6be6b3d2fb77b884d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18fdcc2832b9fe7bc142d047cadc795.png)
A.![]() | B.![]() | C.![]() | D.10 |
您最近一年使用:0次
2020-07-11更新
|
227次组卷
|
2卷引用:山东省烟台理工学校2019-2020学年高二下学期线上期中考试数学试题
名校
10 . 设离散型随机变量
的概率分布如下,
若随机变量
满足
,,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a410f3a274456b579cc10d8a32ee012c.png)
______ ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f412feb8dcad5599ddfe1d1ceb00ac0b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | 0 | 1 | 2 |
![]() | ![]() | ![]() | ![]() |
若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af87266d442c1a981bf9b1b3f0bac2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a410f3a274456b579cc10d8a32ee012c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f412feb8dcad5599ddfe1d1ceb00ac0b.png)
您最近一年使用:0次