数据:
Name Sex Weight year
Henry M 102.5 2005
James M 83 2005
Jane F 84.5 2005
Janet F 102 2005
Jeffrey M 84 2005
John M 99.5 2005
Joyce F 60 2005
Judy F 90 2005
Ronald M 120 2005
William M 134 2005
Alfred M 112.5 2006
Carol F 102.5 2006
Henry M 102.5 2006
Janet F 112.5 2006
Joyce F 50.5 2006
Judy F 90 2006
Ronald M 133 2006
William M 112 2006
Alfred M 2007
Carol F 92 2007
Henry M 113 2007
Janet F 5 2007
Jeffrey M 90 2007
Joyce F 60 2007
Judy F 95 2007
Ronald M 125 2007
William M 107 2007