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To find the mean of a data set you have to add all your numbers then divide by how many numbers are in the data set.
38 + 32 + 26 + 20 + 15 + 12 = 143
143/6 = 23.8
If you round it will be 24.
So your answer is 24.
Hope this Helps!!
a.24
Add all the number together then divide by the amount of numbers there are