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The mean of the data set is calculated by adding up all the numbers in the set and then dividing by the total number of values.
Mean = (23 + 32 + 38 + 19 + 28 + 27 + 18 + 36 + 29 + 26 + 32) / 11
Mean = 308 / 11
Mean = 28
So, the mean of the data set is 28.