The Universal Computer Company wants to forecast the monthly sales of their newly introduced tablet computer using the following historical sales data: Month Sales (units) 1 8,000 2 10,000 3 12,500 4 11,000 5 10,500 6 11,500 7 11,000 Use the information in Table 8.7. Forecast the monthly sales for month 8, using the three-month moving-average method