The 3-year moving totals of the production (in thousand tonnes) of a mine, placed against the years 2020, 2021, 2022 and 2023, are 96, 105, 117 and 126 respectively. The 3-year moving averages for these years are
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 32, 35, 39, 42
A 3-year moving total is the sum of three consecutive values, placed against the middle year. The 3-year moving average is this total divided by 3:
\( \displaystyle 2020: \frac{96}{3} = 32 \)
\( \displaystyle 2021: \frac{105}{3} = 35 \)
\( \displaystyle 2022: \frac{117}{3} = 39 \)
\( \displaystyle 2023: \frac{126}{3} = 42 \)