A convenience store recently started to carry a new brand of soft drink. Management is interested in estimating future sales volume to determine Use the exponential smoothing $($let $\backslash$alpha $=0\mathrm{.}4$ with an initial forecast for week $1$ of $617)$ methods to forecast demand for week $13.$ Obtain the exponential smoothing forecast. The forecast for week $13$ is $($Enter your response rounded to the nearest whole number.$)$ Specify the mean absolute deviation $($MAD$)$ and mean absolute percent error $($MAPE$).($Enter your responses as real numbers rounded to two decimal places.$)$