I've solved part of the problem but need help with the a-3, b and c please. I've included everything leading up to those. Thank you!

Quarter 2005 2006 2007 2008 2009 2010

Qtr1 5,200 5,103 6,055 7,340 7,110 7,600

Qtr2 6,296 6,445 7,685 9,025 8,204 8,651

Qtr3 6,023 6,394 7,642 8,293 8,005 8,403

Qtr4 5,537 5,885 7,283 7,005 7,456 10,471

(a-1)Use MegaStat or Minitab to deseasonalize Coca-Cola's quarterly data.(Round your answers to 3 decimal places.)

2005 1,047 0.961 2006 0.877 1,090 1,052 0.927 2007 0.909 1,099 1,043 0.951 2008 0.930 1.134 1,050 0.904 2009 0.934 1,073 1,031 0.946 2010 0.954 1,028 0.921 1,085 1,014 0.937