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The mean of the data set is calculated by adding all the numbers together and then dividing by the total number of items in the set.
23 + 32 + 38 + 19 + 28 + 27 + 18 + 36 + 29 + 26 + 32 = 288
288 / 11 = 26.18
Therefore, the mean of the data set is 26.18.