Question: Given the following Time Series sales data: 2015 12.2 2016 12.1 2017 139 2018 13.8 2019 14.1 How would you calculate the 3-year mean smoothing

Given the following Time Series sales data: 2015 12.2 2016 12.1 2017 139 2018 13.8 2019 14.1 How would you calculate the 3-year mean smoothing value for 2016? (12.1+13.9+13 8)/3 2014's data is needed (12.2+12.1+13.9)/3 (12.2+13 9+14.1)/3

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