Hudson Marine provides boats sales, service, and maintenance. Boat trailers are one of its top sales items. Suppose the quarterly sales values for the seven years of historical data are as follows. Do not round intermediate calculations                   Year Quarter 1 Quarter 2 Q3   Q4   Total yearly sales   1 7 13 10   4   34   2 12 20 14   5   51   3 16 28 21   13   78   4 19 29 26   20   94   5 20 32 26   20   98   6 26 35 31   22   114   7 30 39 37   28   134   Questions i need help with are in the images

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