thanks for the help!

Monthly sales for Computer Success are shown below: Given the data, what is the average forecast error (i.e., mean bias) if you use a 3-period weighted moving average to complete the forecast table? In this case, the weights are 0.5,0.375, and 0.125 with the highest weight being attributed to the most recent data. Using the same data as in Question 4, what is the mean absolute percent error (MAPE) for the data using the 3-period moving average? For this case, enter your percentage as a whole number (e.g., 12 as opposed to 12\% or 0.12 ) Using the same data as in Question 4, what is the mean absolute deviation (MAD) for the data using the 3-period weighted moving average