UVA10886 标准差 Standard Deviation

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=20&page=show_problem&problem=1827 [PDF](https://uva.onlinejudge.org/external/108/p10886.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10886/5a22f9bc6047b251a4a52a1f73e4d52020db2a77.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10886/f66752995383b83e923795107abcb664772dda3b.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10886/b475ccfc3ec20c364f7db6bf646684f92ea41976.png)