Add all of the numbers, and divide the result by how many numbers there are.
21 + 17 + 14 + 28 + 15 = 95
95 / 5 = 19
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min= 12 max=21 median=17 mode=17 mean=191
(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
It is: 14+15+22+21 = 72/4 => 18 which is the mean average
17
There isn't one.