$\backslash$table$[[$Week$,1,2,3,4,5,6,7,8,9,10],[$Demand$,19,20,28,38,26,28,37,20,26,30],[$Forecast$,19\mathrm{.}0,19\mathrm{.}0,19\mathrm{.}50,23\mathrm{.}75,30\mathrm{.}88,28\mathrm{.}44,28\mathrm{.}22,32\mathrm{.}61,26\mathrm{.}30,26\mathrm{.}15]]$

b$)$ For the forecast developed using exponential smoothing $(=0\mathrm{.}50$ and initial forecast $19\mathrm{.}0),$ the MAD $=$ sales $($round your response to two decimal places$).$