Question: Table 2.1: Actual sales data for the reading glasses during 2021 Month Actual Sales (Pairs of reading glasses) January 2021 2 800 February 2021 3
Table 2.1: Actual sales data for the reading glasses during 2021
| Month | Actual Sales (Pairs of reading glasses) |
| January 2021 | 2 800 |
| February 2021 | 3 000 |
| March 2021 | 5 000 |
| April 2021 | 4 000 |
| May 2021 | 5 600 |
| June 2021 | 8 000 |
| July 2021 | 8 000 |
| August 2021 | 7 900 |
| September 2021 | 6 000 |
| October 2021 | 4 050 |
| November 2021 | 4 900 |
| December 2021 | 5 550 |
Using the sales data of the reading glasses in Table 2.1, 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)
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