find the mean in a set of frequency distribution
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Add the min and max numbers and divide that sum by two. Here is an example: The data is {1, 1, 3, 50,60} The midrange is 30.5 since that is is (1 + 60) / 2 = 30.5.
Add up the numbers, and then divide by the number of numbers in the set. This will give you the mean.
The average of a set of numbers is the sum of the numbers in the set divided by the number of elements in the set.
Total of the numbers divided by the numbers of times the figures appear
2,8,7,9,1,9,15,15,15