Averaging in Microsoft Excel is easy, until you start excluding specific values. Here are three ways to average a data set when giving special consideration to the highest and lowest values.

Quintiles are simply four numbers that break up numerical data sets into five equal parts. For example, if you took the number set of 1,2,3 and 4, the quintiles would be 1.6, 2.2, 2.8 and 3.4, as ...