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In any given set, the arithmetic mean is the average, which is the sum total of the numbers divided by how many numbers there are.

Ex. (10, 17, 20, 45, 68)

68 + 45 + 20 + 17 + 10 = 160

There are 5 numbers in this set.

160/5 = 32

The mean is 32.

The explanation uses the variable "n" because it doesn't know how many numbers are in the set.

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