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QUESTION 4 (20 marks) Using the sales data of the reading glasses in Table 2.1 (question 3 ), answer the following questions: 4.1 Calculate the three-month-weighted-moving-average monthly forecasts for the period April 2021 - December 2021. Use weights of 0.5, and 0.2 for the most recent and oldest monthly data respectively and 0.3 for the middle month (show all workings). (9 marks) 4.2 Determine the Mean Absolute Deviation (MAD) of the three-month-weighted-movingaverage monthly forecasts for the April - December 2021 period. (4 marks) a. The linear regression equation of the sales of reading glasses for the 2021 financial year is given by the expression: y=201.4x+4091 (where ' y ' denotes monthly sales, and ' x ', the number representing the month. For example, x=1,2,3, etc., if the month is January, February, March, etc.). Use the regression equation to determine the Mean Absolute Deviation (MAD) of the regression forecasts for the April - December 2021 period. (5 marks) Tabie 2.1: Actual saies data for the reading glasses during 2021