Question: The following data shows the annual sales revenue for Colonial Event Management from 2001 to 2009. Using the moving average method, develop a four-year centered moving average for this series of annual sales data. You must show your work. (15 points)

Year Sales ($mn)

2001 8

2002 11

2003 9

2004 14

2005 9

2006 10

2007 10

2008 8

2009 12