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The only number in that list that doesn't divide by 4 is 38.
3.8 is a higher number
20
12
18
30
38, not being divisible by four.
38
36
38+46+15+27+36 = 162 and 162/5 = 32.4 which is the mean average
36, 37 and 38.
38-36 = 2
The median (middle) of these numbers is 36.