From NCAA.com—the official Web site for NCAA sports—we obtained the National Collegiate Athletic Association wrestling champions for the years 1989–2013 in the document “Championship History”. They are displayed in the following table.

We have presented a frequency distribution of qualitative data. For each exercise,

a. Obtain a relative-frequency distribution.

b. Draw a pie chart.

c. Construct a bar chart

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Year Champion 1989 1990 1991 Iowa 1992 Iowa 1993 Iowa 1994 1995 Iowa 1996 Iowa 1997 Iowa 1998 Iowa 1999 Iowa 2000 Iowa 2001 Minnesota Oklahoma St. Oklahoma St. Oklahoma St. Year Champion 2002 Minnesota 2003 Oklahoma St. Oklahoma St. Oklahoma St. Oklahoma St. Minnesota 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Iowa Iowa Iowa Penn State Penn State Penn State