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13 + 9 + 2 + 11 + 18 + 13 = 66/6 = 11
19
13. It is also the mean.
17
First put them in numerical order,12, 13, 13, 15, 15, 18.since there is an even set of numbers the median is the mean of the two middle numbers12, 13, 13, 15, 15, 18.(13+15)/2=14