A school's enrolment, in hundreds, over six years is 11, 12, 16, 17, 19 and 22. What is the first 5-year moving average?

Explanation

1. 01

   The first 5-year moving average uses $11, 12, 16, 17, 19$.

2. 02

   $\frac{11 + 12 + 16 + 17 + 19}{5} = 15$.