The cumulative error in December is 33 (enter your response as a whole number). The MAD is 10.13 (round your response to two decimal places). For the given forecast, the tracking signal = 3.26 MADS (round your response to two decimal places). The following are monthly actual and forecast demand levels for May through December for units of a produ manufactured by the D. Bishop Company in Des Moines: Actual Demand Forecast Demand Month May 105 102 June 78 108 July 112 101 August 112 101 September 102 108 October 110 102 November 125 108 December 115 109 For the given forecast, the tracking signal MADS (round your response to two decimal places).