Here are the actual tabulated demands for an item for a nine-month period (January through September). Compute the MAD of forecast errors. Using the RSFE, compute the tracking signal for every week. Actual 110 130 Month January February March April May Month June July August September Actual 180 140 130 150 170 160 140 Here are the actual tabulated demands for an item for a nine-month period (January through September). Compute the MAD of forecast errors. Using the RSFE, compute the tracking signal for every week. Actual 110 130 Month January February March April May Month June July August September Actual 180 140 130 150 170 160 140