The mean of a set of data is the average. You find it by adding the numbers and dividing by the amount of numbers. For example
1, 2, 3, 4, 5, 6, 7
mean = 1+2+3+4+5+6+7 / 7
28/7 (28 is the sum of the numbers, 7 is the amount of numbers in the set)
The mean is 4.
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