调和平均

问题如下：

7. The measure of central tendency that Ritter will most likely recommend is the:

选项：

median.

harmonic mean.

arithmetic mean.

解释：

B is correct.

The harmonic mean is sometimes used to reduce the impact of large outliers ——which are typically the major concern in using the arithmetic mean multiple—— but not the impact of small outliers (i.e., those close to zero). The harmonic mean may aggravate the impact of small outliers, but such outliers are bounded by zero on the downside.