It is important because it is a way to find the average between a group of numbers. This is probably the most practical of the mean, median, mode you have to learn in school because it applies to many things in the outside world.

A good example is sports statistics. They calculate a batter's average by taking the number of atbats (minus walks, hit by pitches and errors) and divide it by the number of hits to find the average that he gets onbase with a hit.

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