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You add up all of your numbers then divide that by the number of numbers you have. That will be the average.
The mathematical mean is another word for an average. To find the mean, add up all the numbers and divide the sum by how many numbers there were to begin with. In this case, when you add the numbers the sum is 137. Divide that by 9 and you get 15.2 as the average.
42 = 20 + 22
94 = 22 + 23 + 24 + 25Four consecutive numbers that add to 94 are 25,26,27,28.