某学校高二年级数学学业质量检测考试成绩
,如果规定大于或等于85分为
等,那么在参加考试的学生中随机选择一名,他的成绩为
等的概率是______ .(若
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc055d2906c978ff99cc85759f924f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0088531480beef86ec5a94a67edf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085328c187ab37ea1b6f74677828c40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2812e19a50b06d8dc8d63a0c0b5c0b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bc1f6574e9b3e90df21e7ec37e8270.png)
更新时间:2023-07-25 12:36:52
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填空题-单空题
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容易
(0.94)
【推荐1】已知随机变量X服从正态分布
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c80d5867733b7195332bf418af149f.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778dfb406e5ca6131f7e39a1cdf145c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b887ab4da2cd91fcd72016447797a73.png)
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您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
解题方法
【推荐2】设随机变量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aef464b1f0e9c7e4a33f0741ee1726f.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90f12392733f7d31b5dadaa7ec2e190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223cc7e948ba5ee9dd57beb4d47e5540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aef464b1f0e9c7e4a33f0741ee1726f.png)
您最近一年使用:0次