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 Related Terms
 Mean Proportional:  The mean proportional of n numbers is the nth root of their product. Also called the geometric mean.
Mean: The sum of the numbers in a set of data divided by the number of pieces of data. This is what we usually call "average." Also called the arithmetic mean.
Geometric Mean: If a/x = x/b (or x2 = ab), then x is called the geometric mean between a and b. The geometric mean is sometimes called the mean proportional.
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.".