0
Anonymous
The mean is 13.29
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13 and 2/7
16, 12+15+21 = 48/3 = 16
composite numbers between 11 and 21:12 14 15 16 18
3.898717738 is the standard deviation.
Order them: 15 16 17 21 21 Find the middle one: 17 That is the median
16