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解题方法
1 . 设随机变量
服从正态分布
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778dfb406e5ca6131f7e39a1cdf145c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fe883bc5006fced4ccc824da98c39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b09be82d9c7b9d54336f616325ef15d.png)
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