Sales of tablet computers at JJ's electronics store in Coral Gables, over the past 10 weeks are shown in the table below:

Week 1 2 3 4 5 6 7 8 9 10

Demand 20 21 29 36 24 29 37 24 26 29

For the forecast developed using exponential smoothing with alpha=0.6 and a week 1 initial forecast of20, the MAD is _______(round your response to two decimal places).