Question

1. Find the average of the prime numbers in the following list:
5, 11, 13, 1, 16, 19, 21​

Answer 1

12

Explanation:

there are 4 prime numbers

5, 11, 13, 19

4/7 were prime

add 5, 11, 13 and 19 together and divide by 4

5+11+13+19

-----------------

4

add

48

----

4

divide top by bottom

=12