Don't know what am I doing wrong here

Question 14 of 15 1.23/4 E View Policies Show Attempt History Current Attempt in Progress Your answer is partially correct. A producer of picture frames uses a tracking signal with limits of 24 to decide whether a forecast should be reviewed. Given historical information for the past four weeks, compute the tracking signal and decide whether the forecast should be reviewed. The MAD for this item was computed as 2. (For tracking signal: round your answers to 1 decimal place, e.g. 3.5.) Actual Sales Weeks Forecast Deviation Cumulative Deviation Tracking Signal 3,0 35 1 10 11 2 40 11 !!! 12 4.5 3 13 14 13 6,5 10 14 The forecast should be reviewed in week 44 e Textbook and Media Attempts: 2 of 3 used Submit Answer Thunforster