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 Arithmetic Mean:  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.

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.