Mean = (15 + 12 + 16 + 13)/4 = 56/4 = 14
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14
There are at least four sets:{11, 16, 16, 16, 16}{12, 13, 16, 17, 17}{12, 14, 16, 16, 17}{12, 13, 16, 17, 17}There are infinitely more possibilities with fractions.
The mean of those numbers is equal to 12.916 recurring (that is, 12.91666....)
115/10 = 11.5
Arrange the numbers in ascending order: 7 9 9 12 13 15 16 and the middle number is the median which is 12