If m is the average of the first 10 positive multiples of 5 and M is the median of the first 10 positive multiples of 5, what is the value of M – m?

Question: If m is the average of the first 10 positive multiples of 5 and M is the median of the first 10 positive multiples of 5, what is the value of M – m?

Solution:
The first 10 multiples of 5 are = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.
average of these numbers is, m = (5 + 10 + 15 + 20 + 25 + 30 + 35 + 40 + 45 + 50)/10
= 27.5

the median of these numbers, M = (25 + 30)/2 = 27.5

∴ M - n = 0