It depends on where you are but if you are in the America it should be just 18.
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16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
Mean (12, 18, 19, 20, 21) = 18
95/100 = 19/20
20.37 is the mean.
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.