Arithmetic mean
Revision as of 16:22, 17 June 2006 by IntrepidMath (talk | contribs)
Arithmetic Mean
The arithmetic mean of a set of numbers (or variables) is the sum of all the numbers, divided by the number of numbers. For example, if I wanted to find the average of the numbers 3, 1, 4, 1, and 5, I would compute: 
. Arithmetic means are also called averages. Arithmetic means show up frequently in contest problems.
