$[$Mountain Aquaculture and Producers Association $($MA&PA$\}$ is a small trout producers' cooperative in West Virginia$\mathrm{.}12$ Its main product is boned. headremoved trout sold to local stores. One of the problems MBA is facing is that the demand for its products is seasonal $($see the sales in pounds of boned, headremoved trout from Q$11997$ to Q$32000$ below$).$ The manager would like to plan production better. $19984221,0981,93984320006981,0761,149$ a$.$ Compute the seasonal relative for each quarter using the centred moving average method. b$.$ Deseasonalize the data, t an appropriate model to the deseasonaliaed data. extend the model four quarters, and reseasonalize these in order to forecast the sales of boned. headremoved trout from the fourth quarter of $2000$ to third