A textbook publishing company has compiled data on total annual sales of its business texts for the preceding nine years: Year Sales (000): 2. 45.00 3 49.80 4 51.00 5 54.60 6 57.60 7 63.40 8 68.80 9 74.90 37.10 Click here for the Excel Data File a. Using an appropriate model, forecast textbook sales for each of the next five years. (Round your intermediate calculations to 3 decimal places and final answers to 2 decimal places.) 10 11 12 13 14 Year Forecast b. Compute +/- 2s control limits for the control chart for forecast errors using just data from the original nine periods. (Round your intermediate calculations to 4 decimal places and final answer to 2 decimal places.) Control limits are 0+ c. Suppose actual sales for the next five years turn out as follows: Year Sales (000): 10 78.60 11 82.40 12 88.90 13 92.00 14 96.90 Is the forecast performing adequately