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An average is a way to compute, from a group of numbers, what would a "typical" number be. For example, we can talk about "the average height of six graders in Boondock county".
Normally, average (Arithmetic mean) is computed as the sum of numbers, divided by their quantity. Mathematicians also like to write it using the sum symbol Lessons under this topic consider Arithmetic mean, Geometry mean, and Median.
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