Question

What is the arithmetic mean of the integers from 16 to 20, inclusive?

Answer 1

The mean of sequential integers is the middle number, namely 18.

Alternatively, we can calculate the mean
(16+17+18+19+20)/5=90/5=18.

We can also think of the mean as
(18-2+18-1+18+18+1+18+2)/5=5*18/5=18