Mron Sheu, the owner of the Chocolate Outlet Store, wants to forecast chocolate demand. Demand for the preceding four years is shown in the following table:

$\backslash$table$[[$YEAR$,$DEMAND $($POUNDS$)],[1,64,200],[2,65,900],[3,74,400],[4,69,700]]$

a$.$ Forecast demand for Year $5$ using a three$-$year moving average. Round your answer to the nearest whole number.

pounds

b$.$ Forecast demand for Year $5$ using a three$-$year weighted moving average using $0\mathrm{.}50$ for Year $4,0\mathrm{.}30$ for Year $3,$ and $0\mathrm{.}20$ for Year $2.$ Round your answer to the nearest whole number.

pounds

c$.$ Forecast demand for Year $5$ using exponential smoothing with $a=0\mathrm{.}50,$ and assuming the forecast for Year $1=63,400.$ Do not round intermediate calculations. Round your answer to the nearest whole number.

pounds