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【单选题】
在一组数据x 1 ，x 2 ，…x n 中，各数据与它们的平均数 的差的绝对值的平均数，记作 叫做这组数据的“平均差”。一组数据的平均差越大，就说明这组数据的离散程度越大。则样本：1、2、3、4、5 的平均差是 [     ]
A.
B.
3
C.
6
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