Question

find the mean of the first 12 prime numbers

Answer 1

FIRST 12 prime numbers are 2,3,5,7,11,13,17,19,23,29,31.
Mean=sum of all terms divided by total number of terms.=2+3+5+7+11+13+19+23+29+31/12
        = 160/12
         = 13.333..
approx.13.4
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Answer 2

First 12 prime numbers are:
1. 2
2.3
3.5
4.7
5.11
6.13
7.17
8.19
9.23
10.29
11.31
12.37

$mean \: = \frac{sum \: \: of \: observations}{number \: \: of \: \: observations} \\ \\ mean \: \: of \: \: first \: \: 12 \: \: prime \: \: numbers \: \\ = \frac{2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37}{12} \\ \\ = \frac{197}{12} \\ \\ = 16.41$

So mean of first 12 prime numbers = 16.41