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Task 3 - Demand Forecasting Data is given for the sales of a leading mobile company across Oman. The sales of the mobile company over the past 12 -month period for the year 2021 is given in Table T3. Table T3 - Sales Data of Year 2021 a. Calculate the monthly demand forecast for the 6-month period from January 2022 to June 2022 using 4-month weighted moving average method. Use weights of 0.4,0.3,0.2 and 0.1, with heavier weights for more recent months