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n个数求平均值
Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:32768KB
Total submit users: 89, Accepted users: 85
Problem 11601 : No special judgement
Problem description
  n个数求均值。

Input
  输入有若干行,每行第一个是一个正整数n(n<1000),其后还有n个32位整数。

Output
  对每一行输入,输出这n个数的平均值,保留2位小数。

Sample Input
2 3 4
Sample Output
3.50
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