The following is 12 years’ demand for Viking Village, a game now available for handhelds and smartphones.

Year Demand

1998 ............20,123

1999 ............18,999

2000 ............20,900

2001 ............31,200

2002 ............38,000

2003 ............41,200

2004 ............49,700

2005 ............46,400

2006 ............50,200

2007 ............52,300

2008 ............49,200

2009 ............57,600

a. Graph the demand data for Viking Village.

b. Determine the linear trend for Viking Village using a three-year moving average.