The sum of the numbers in a set of data divided by the number of pieces of data. Also simply called "mean." This is what we usually call "average.".
Arithmetic Mean - MathWorld
: Math World defines the arithmetic mean and gives other relating links.
Arithmetic Mean - Wikipedia
: A website where Wikipedia goes into detail about the arithmetic mean.
: A definition about the arithmetic mean of a group of numbers.
Arithmetic vs Geometric Mean
: The Math Forum's comparison between the arithmetic and the geometric mean.
Examples of Arithmetic and Geometric Means
: Two examples of problems that involve arithmetic and geometric means.