The fоllоwing dаtа shоws the аverage sales for textbooks at a university bookstore. Season 1 covers August-September, Season 2 covers December-January, Season 3 is other Year Season Sales 1 1 610 2 775 3 250 2 1 686 2 864 3 302 3 1 721 2 952 3 399 Calculate the centered moving three-month averages for year 1 season 3 and year 2 season 1.