Question: I was able to compute all possible forecasts using 6 period simple moving average model. I was also able to forecast the demand for period

I was able to compute all possible forecasts using 6 period simple moving average model. I was also able to forecast the demand for period 11 to be 125.2.

I am having trouble computing MAD, I am coming up with 5.5.

I am also struggling with the error associated with the 11th period forecast, I am coming up with zero

Period	Demand
1	130
2	122
3	121
4	112
5	141
6	105
7	116
8	118
9	146
10	125

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