Question: I need help pls ! ! ( 2 0 pts ) Compute the mean absolute deviation ( MAD ) . Intermediate steps shown in colume

I need help pls!!(20 pts) Compute the mean absolute deviation (MAD). Intermediate steps shown in colume D.
(5 pts) Compared to the exponential smmothing method, do you think a forecasting method that corrects for trend and seasonality can provide better forecast? Why?
Hint. Please check whether the demand history shows trend or seasonality.
I need help pls!!(20 pts) Compute the mean absolute deviation (MAD).

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