O enue ($ billions) The following table shows a company's annual revenue (in billions of dollars) for 2009 to 2014. Year Period (t) Revenue ($ billions) 2009 1 23.8 2010 2 29.2 2011 3 37.8 2012 4 50.2 2013 5 59.7 2014 6 (a) Construct a time series plot. 80 70 60 50- 40- 30- Revenue ($ billions) 80 20 66.6 80 70 60 50 40 30 20 10 Revenue ($ billions) 10- 0 0 1 2 3 4 5 7 0 2 3 4 5 6 7 Period 00 Period 70- 60 50 40 30 80 70- 60 50- 40 30 enue ($ billions)