A calculated "central" value of a set of numbers.
To calculate it: add up all the numbers, then divide by how many numbers there are.
Example: what is the average of 2, 7 and 9?
Add the numbers: 2 + 7 + 9 = 18
Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6
So the average is 6
(Also called the Arithmetic Mean.)
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