What is average?

An average (usually the mean) can hide the distribution behind it: a town with nine poor families and one billionaire has a high average income.

LSAT questions use averages to mislead: ask whether the average describes the typical case or is pulled by outliers.

A change in the average does not mean every member changed. The composition of the group may have shifted instead.

When an argument leans on an average, check the median too. A median sometimes tells the truer story.