2. Jimbo used his top-secret forecasting method to provide a forecast for the first six months of the year. Take a look at forecasted and actual demands below: NOTE: You will need to show ALL calculations - deviations, RSFE, Absolute Deviation, Sum of Absolute Deviations, MAD, and the Tracking Signal. Forecasted Actual Demand January 550 500 February 675 600 March 720 690 April 640 620 May 700 650 June 750 690 a. Find the MAD and the Tracking Signal (provide math or Excel file) (30 pts) b. Based on the Tracking Signal, tell me if you think Jimbo's top secret method is accurate and WHY. (10 pts