名校
1 . 郫都区高
级理科学生参加“成都一诊”考试的数学成绩
服从正态分布
,下列结论中不正确的是( )
(附:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f95463e4696bcb6ed28581bad689d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2737ede793502983c82a7f3908a90aa9.png)
(附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfe03eec167ad6b4d0fdc69b55ae11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe95fb8a21bb27b53ebfd75433e17da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a30f0cf191aafbcd5d7695b9de6a825.png)
A.![]() ![]() |
B.当![]() ![]() |
C.无论![]() ![]() ![]() |
D.无论![]() ![]() ![]() |
您最近一年使用:0次
2022-03-14更新
|
483次组卷
|
3卷引用:四川省成都市郫都区2021-2022学年高三第三次阶段考试数学(理)试题
名校
2 . 通过大数据分析,每天从岳阳来长沙的旅客人数为随机变量
,且
.则一天中从岳阳来长沙的旅客人数不超过3100的概率为( )(参考数据:若
,有
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c775c60b72bbef04dbef23ad734c0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c1ed67167078ea4f5f1ee53ee14164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfabf2bd8ed23270369e69d44b421a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613a8908371b014a8584f42839cc88af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b77b9ab66e9df270ea484a5ab1e4ca.png)
A.0.0456 | B.0.6826 |
C.0.9987 | D.0.9772 |
您最近一年使用:0次
2020-02-22更新
|
1587次组卷
|
7卷引用:四川省棠湖中学2019-2020学年高三下学期第二次月考数学(理)试题
解题方法
3 . 若随机变量
服从正态分布
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce6848234873c13bb9bd0f05f38870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194d10285633883ed5220c8a1cb0827f.png)
A.![]() | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
2016-12-04更新
|
698次组卷
|
2卷引用:2017届四川成都七中高三10月段测数学(理)试卷