A tourist center is open on weekends $($Friday$,$ Saturday, and Sunday$).$ The owner$-$manager hopes to improve scheduling of part$-$time employees by determining seasonal relatives for each of these days. Data on recent traffic at the center have been tabulated and are shown in the following table:

Week

$123456$

Friday $138148148148153158$

Saturday $248248258258273273$

Sunday $158158168168168178$

Click here for the Excel Data File

a$.$ Develop seasonal relatives for the shop using the centered moving average method. $($Round your intermediate calculations and final answers to $2$ decimal places.$)$

b$.$ Develop seasonal relatives for the shop using the SA method. $($Round your intermediate calculations and final answers to $4$ decimal places.$)$

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