1 . 已知随机变量
,且其正态曲线在
上是增函数,在
上是减函数,且
.
(1)求参数
,
的值.
(2)求
.
附:若
,则
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eabc233d26d25e72a6f02be823a117d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f7ce16ffaaa0d1b453b77efd8f9ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5429fc948aaba381bca84d1130c63906.png)
(1)求参数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d55a93a80a0c97061c2d7d780d5889.png)
附:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8f8641d4e8bbabc1e726417ac3c8cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1c9871a68a9f90d1a27d3559aa974a.png)
您最近一年使用:0次
名校
2 . 若随机变量
服从正态分布
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9da71835761b091d8eb93ef1c179ee.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcc248a7770a16fa10fc4602d71e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae47f2a64baaf66073398e9c703cfaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9da71835761b091d8eb93ef1c179ee.png)
您最近一年使用:0次
2022-07-08更新
|
455次组卷
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4卷引用:广西玉林市普通高中2021-2022学年高二下学期期末教学质量监测数学(理)试题