Find the average of first ten multiplies of 5

Find the average of first 20 multiples of 7

Find the average of first 10 multiples of 4.

The average of first 5 multiples of 5 is

Find the average of the first four multiples of 7

Find the average of first 5 consecutive even numbers starting from 2 to 10, where the last even number is 10.

The average of first ten prime numbers is:

The mean of the first ten multiples of 2 is ______ .