在
分布中,设
,则
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a359f9aeb5add5377519c6f7650ae6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6238e31faa720ae9f25b47a962e513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
10-11高二下·江苏南通·期中 查看更多[2]
更新时间:2016-11-30 21:06:14
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解题方法
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