find the mean of first five multiples of 10

The first five multiples of 10 are 10, 20, 30, 40, and 50.

Sum of first five multiples of 10 = 10 + 20 + 30 + 40 + 50 = 150

Mean of  first five multiples of 10

Thus, the mean of  first five multiples of 10 is 30.