1. The plant manager of Specific Motors, is trying to plan cash, personnel and materials and supplies for each quarter of next year. The quarterly sales data for the past three years seems to fairly reflect the seasonal output pattern that should be expected in the future. The following table gives the sales for each quarter for three years. Use a moving average method (centered at the third) to find the original data as percentage of moving average for the first, second and third quarter of 1988 Number Four Average Moving Percentage Year Quarter Quarter 4-Quarter Average of Moving Sales Total Total Average 1987 520 730 820 530 1988 590 810 HEER- 900 600 1989 650 900 III 1000 IV 650