单选题 The least accurate statement about measures of dispersion for a distribution is that the:

A、 range provides no information about the shape of the data distribution.
B、 arithmetic average of the deviations around the mean will always be equal to one.
C、 mean absolute deviation will always be less than or equal to the standard deviation.

【正确答案】 B

【答案解析】[解析] 平均值离差的算术平均值总是等于0。
从数学的角度来讲，该性质可以用下式来表示：