the average (arithmetic mean) of x,y,z,5,and 7 is 8 还是这个问题

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the average (arithmetic mean) of x,y,z,5,and 7 is 8 还是这个问题
如果这组数据的极差是2也就意味着最小数字是5,最大数据是7
但是这种情况是不可能的啊,这样这组数据哪怕是上限：5,7,7,7,7 平均值是6.多也远远小于8啊,所以极差不可能是2,只能比2大.这个选项真费解

你说的是对的.
如果极差是2,而且最小的数是5,那么最大的数就是7.因此,平均值不可能是8.
再问：平均值是题目中条件给的，所以只能是这个选项不对不能选吧？
再答：不好意思，不知道原来的题是什么。

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