2. 外语
  3. There are five positive numbers n+2, n+1, n-2, n and n+9, which of the following could be the difference between the mean and th

There are five positive numbers n+2, n+1, n-2, n and n+9, which of the following could be the difference between the mean and th

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问题 There are five positive numbers n+2, n+1, n-2, n and n+9, which of the following could be the difference between the mean and the median?
选项 A、4
B、2
C、n-1
D、n+2
E、1
答案E
解析 这5个数的平均值为

=n+2
求median，首先要排序，如果按照从小到大排序，得到n-2，n，n+1，n+2，
n+9，中位数为n+1，(n+2)-(n+1)=1，选择E。
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