文件名称:Theaveragedryinteger
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：输入数据含有不多于5组的数据，每组数据由一个整数n（1<n<50）开头，表示后面跟着n个数据。每组数据，输出其平均数，精确到小数点后3位，每个平均数应该单独占一行。
-Input data contained not more than 5 groups of data, each group of data from an integer n (1) < < n, says followed by n data. Each set of data, the average output, precise arrives decimally hind, every single line should mean.
-Input data contained not more than 5 groups of data, each group of data from an integer n (1) < < n, says followed by n data. Each set of data, the average output, precise arrives decimally hind, every single line should mean.
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Theaveragedryinteger.txt