25 consecutive integers sum up to 225. What is the average of these numbers?
The numbers are:
(-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21) =225
225/25 = 9 - the average of the 25 numbers
