The following are monthly actual and forcasted demand level for may through December for units of product manufactured by N.
Month Actual demand Forecast demand
May 100 102
June 78 100
July 110 97
August 115 101
September 108 108
october 110 106
November 125 102
December 115 111
For the given forecast, the tracking signal = ? MADS (Round to two decimal places)