The Raw Materials Price Index tracks the changes in prices of raw materials for purchase by Canadian industry. The Raw Materials Price Index graph in Ontario from 1987 to 2002 is shown below. Use it to answer the following questions.

1. The following are the test results for a grade 12 math class of 20 students: 82 85 94 96 72 79 81 97 65 91 68 86 83 72 92 72 84 97 81 75Raw Materials Price Index, Canada, All Items 165 160 155 150 145 140 135 130 125 120 1997 = 100 15 70 1960 1961 1982 1963 1964 1985 1965 1967 1968 1969 1980 1991 1982 1983 1994 1995 1986 1997 1986 1989 2000 2001 2002 2003 2004 2005 2006 2007 Year