In evaluating evidence, you should remember that the mean is the best measure of central tendency if there are no extreme values in the data set, and the is the best measure if there are extreme values.

Median

Explanation:

In evaluating evidence, you should remember that the mean is the best measure of central tendency if there are no extreme values in the data set, and the median is the best measure if there are extreme values.  The median is the middle value in the list of number, it separates the higher half from the lower half in a data sample and its major advantage over the mean is that it is not affected by extreme numbers as with the mean and as such useful when considering extreme measures.

answer; (regions)