Question

find the mean of first 10 prime numbers

Answer 1

those no. which can be only divided by itself or 1 are called prime no.
the first 10 prime no. are
2  3   5   7  11  13  17  19  23   29
mean=2+3+5+7+11+13+17+19+23+29/10
=12.9

Answer 2

First 10 prime numbers are 2,3,5,7,11,13,17,19,23,29
Mean = sum of observations/no.of observations
⇒(2+3+5+7+11+13+17+19+23+29)/10
⇒129/10
⇒12.9
∴The mean of first ten prime numbers is 12.9