What's the average of the following set of numbers? (9, 9, 2, 2)

5.5

Explanation

The average of a set of numbers is the sum of the numbers divided by how many numbers are being averaged. So, the average of 9, 9, 2, and 2 is (9 + 9 + 2 + 2) / 4 or 22 / 4 = 5.5.

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