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Moving Average Forecast Sales

4 (b) Refer to the table and graph in Appendix 1. Calculate SWF’s forecast sales for Quarter 3 in 2019.
Summer 2019 Paper 32

Predicted trend from inspection of graph: 40.8 Allow ±0.2 i.e. 40.6 – 41
Add average seasonal variation Q3 = 11.97
Forecast = 52.77 thousand litres or 527 700 litres