18
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20.37 is the mean.
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20
the median for 16,16,16,16,16,16,16,16,17,17,17,17,17,17,18,18,18,20,21,25 is 17
The arithmetic mean is defined as the sum of the individual members of the population divided by the number of members. The mean score for the nine members of Mt. Dexter's team is (15 + 20 + 19 + 20 + 16 + 20 + 14 + 18 + 17) / 9 = 159/9 = 17 and 2/3 (17.666 repeating)
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238