For the given six values 17, 22, 21, 35, 40, 51, the three years moving averages are
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 20, 26, 32, 42
Each three-yearly moving average is the mean of three consecutive values:
(17 + 22 + 21)/3 = 20
(22 + 21 + 35)/3 = 26
(21 + 35 + 40)/3 = 32
(35 + 40 + 51)/3 = 42