prime numbers below 20 are 2,3,5,7,11,13,17,19 total 8 numbers
mean= (2+3+5+7+11+13+17+19)/8 = 77/8 = 9.625
Prime numbers are 1,23,5,7,11,13,17,19
Mean = (1+2+3+5+7+11+13+15+17+19)/9
78/9
8.6
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