Question

For the given five values 12, 15, 18, 24, 36; the three-year moving averages are:

• A. 15, 25, 21
• B. 15, 27, 19
• C. 15, 19, 26
• D. 15, 19, 30

Answer 1

Answer: (C)

15, 19, 26

Answer 2

The three-year moving average is calculated by taking the average of three consecutive numbers.

First moving average:

$\text{Average} = \frac{12 + 15 + 18}{3} = \frac{45}{3} = 15.$

Second moving average:

$\text{Average} = \frac{15 + 18 + 24}{3} = \frac{57}{3} = 19.$

Third moving average:

$\text{Average} = \frac{18 + 24 + 36}{3} = \frac{78}{3} = 26.$

Thus, the three-year moving averages are 15, 19, 26.