The table here shows the price that US airlines paid for a gallon of fuel since 1980.

a. Identify the 1st, 2nd, and 3rd quartiles, and explain what each indicates.
b. Determine the inter-quartile range and explain what it indicates.

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Year /Gallon 1980 0.86 1981 $1.02 1982 0.97 1983 0.88 1984 $0.84 1985 $0.80 1986 055 1987 $0.55 1988 0.52 1989 0.60 1990 0.77 1991 0.67 1992 s0.62 | 1993 0.59 1994 054 1995 0.55 Year $/Gallon 1996 .65 1997 0.63 1998 0.50 1999 0.52 2000 0.79 2001 2002 $0.70 2003 0.83 2004 $1.13 2005 $1.63 2006 $1.93 2007 $2.07 2008 $2.98 $0.76 2009 .90 2010 2.24 2011 $2.89