某次数学竞赛,全体参赛学生的成绩
服从正态分布
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68cf9633634aca9a4c1f5300fe60aa9d.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66cc1a8006d82a130b9a287a78ea0dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bfd15d3b7d36927c580befb0b90cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68cf9633634aca9a4c1f5300fe60aa9d.png)
更新时间:2020-08-10 14:19:51
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【推荐1】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
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【推荐2】设随机变量
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cfc20df49832385c4d585b0df02f7c.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a65d06af92292219eba7593597a3f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfe26d7271d06ea18eea21b794e2036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cfc20df49832385c4d585b0df02f7c.png)
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