Compute the mean absolute deviation $($MAD$),$ the mean squared error $($MSE$),$ the bias, and the mean average percent error $($MAPE$)$ for the following forecast. $($Note:

the actual demand values are designated by $a_t$ and the forecast values by $F_t).$

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The mean absolute deviation $($MAD$)$ is

$($Enter your response rounded to one decimal place.$)$

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The mean abso

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