please answer a b and c fast

Harlen Industries has a simple forecasting model: Take the actual demand for the same month last year and divide that by the number. of fractional weeks in that month. This gives the average weekly demand for that month. This weekly average is used as the weekly forecast for the same month this year. This technique was used to forecast eight weeks for this year, which are shown below along with the actual demand that occurred. Zoom The following eight weeks show the forecast (based on last year) and the demand that actually occurred: FORECAST DEMAND WEEK ACTUAL DEMAND 137 1 140 2 140 133. 3 130 150 4 142 160 130 180 140 170 147 185 150 205 Y 6 7 8 a. Compute the MAD of forecast errors. (Round your answers to 2 decimal places.) Week MAD 1 2 3 4 5 6 7 8 b. Using the RSFE, compute the tracking signal. (Round your answers to 2 decimal places. Negative values should be indicated by a minus sign.) Week Tracking Signal 1 2 3 4 5 6 7 8 c. Based on your answers to parts a and b, comment on Harlen's method of forecasting. O The forecast should be considered poor. O The forecast should be considered good