Given the following actual and forecast demand of a product, use simple exponential smoothing with a smoothing constant,

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Given the following actual and forecast demand of a product, use
simple exponential smoothing with a smoothing constant, alpha = 0.6
to update the forecast. Choose the closest number if needed.
Week
1
2
3
4
5
Actual Demand
105
100
125
128
140
Forecast demand
N/A
105
What is mean absolute deviation (MAD) as shown in week 5 (MAD
for weeks 2 to 5)?
Group of answer choices
16.2
13.5
15.3
14.3
13.7