| Time Limit | $1$ 秒/Second(s) | Memory Limit | $512$ 兆字节/Megabyte(s) |
| 提交总数 | $8$ | 正确数量 | $9$ | "
| 裁判形式 | 特别裁判/Special Judge | 我的状态 | 尚未尝试 |
| 难度 | 分类标签 | STL |
Standard Deviation
You have final scores of an examination for n students. Calculate standard deviation of the scores s1, s2 ... sn.
The variance α^2 is defined by $$ \sigma = \sqrt{\frac{\sum_{i=1}^{n} (s_i - \mu)^2}{n}}$$ where $\mu$ is an average of $s_i$. The standard deviation of the scores is the square root of their variance.
The input consists of multiple datasets. Each dataset is given in the following format:
n
s1 s2 ... sn
The input ends with single zero for n.
5
70 80 100 90 20
3
80 80 80
0
27.85677655
0.00000000
2<=n ≤ 1000
0 ≤ si ≤ 100
| 本题记录 | 用 户（点击查看用户） | 运行号（点击购买题解） | 时 间 |
|---|---|---|---|
| 算法最快[$0 $ms] | 请问一下安科怎么走 | 449808 | 2019-07-29 14:59:50 |
| 内存最少[$2032 $KB] | 请问一下安科怎么走 | 449808 | 2019-07-29 14:59:50 |
| 第一AC | AOJ大管家 | 332790 | 2018-11-27 23:14:53 |
| 第一挑战 | AOJ大管家 | 332790 | 2018-11-27 23:14:53 |
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