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Calculate Three Yearly moving averages for the following data

Year201620172018201920202021
Production (thousand tonnes)200220231254202243

Solution

✅ Correct Option: 2

A 3-yearly moving average takes any 3 consecutive years, adds their production values, and divides by 3. With 6 years of data, there will be 4 moving averages.

Given Data:

Year201620172018201920202021
Production (thousand tonnes)200220231254202243

For 2016-2018:

Moving Average=200+220+2313\text{Moving Average} = \dfrac{200 + 220 + 231}{3}

=6513= \dfrac{651}{3}

=217= 217


For 2017-2019:

Moving Average=220+231+2543\text{Moving Average} = \dfrac{220 + 231 + 254}{3}

=7053= \dfrac{705}{3}

=235= 235


For 2018-2020:

Moving Average=231+254+2023\text{Moving Average} = \dfrac{231 + 254 + 202}{3}

=6873= \dfrac{687}{3}

=229= 229


For 2019-2021:

Moving Average=254+202+2433\text{Moving Average} = \dfrac{254 + 202 + 243}{3}

=6993= \dfrac{699}{3}

=233= 233


The three-yearly moving averages are: 217, 235, 229, 233

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