标准差 Standard Deviation

题目描述

[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)

输入输出格式

输入格式

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

输出格式

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

输入输出样例

输入样例 #1

5
2 16777216
2 4294967296
10000000 0
2 2147483648
10000 382759482784958

输出样例 #1

Case #1: 0.00001
Case #2: 0.00000
Case #3: 0.00000
Case #4: 0.09375
Case #5: 1283729051.97967