Problem2148--Find standard deviation

2148: Find standard deviation

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 393  Solved: 15
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Description

Input n numbers, calculate the standard deviation of this group of numbers(leave one decimal place)

Input

Input n numbers

Output

Output standard deviation

Sample Input Copy 

1,2,3,4,5,6,7

Sample Output Copy 

2.0

Source/Category

197 
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