Cedar Park operates seven amusement parts and five separately gated water parks. Its combined attendance $($in thousands$)$ for the last $20$ years of data is given in the following table. A partner asks you to

A$.$ Compute a three$-$year weighted moving average forecast for this data, starting in year $2010,$ with weights of $0\mathrm{.}2,0\mathrm{.}3,$ and $0\mathrm{.}5$ for the previous successive years.

B$.$ Determine mean absolute deviation for this forecast within the table, below.