20 = (14 + 26 + 16 + 24) / 4
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21
(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+38)/2 = 26
Put the numbers in order: 9, 14, 16, 18, 20, 24, 26, 27, 28 There are n numbers so the median (the middle one) is the one in position (9+1)/2 ie the 5th. Thus, median = 20.
The average is 27