As reported by the Recording Industry Association of America, the percentage of recorded music dollar sales in CD format was as shown here for the years 2000 through 2007. The data are also in file XR17058.

Using x 5 1 through 8 to represent years 2000–2007, fit a second-order polynomial model to the data and estimate the percentage of music sales in CD format for the year 2015.

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Year 2000 x = Year Code 1 CD Music Percentage 89.3 2001 2002 2003 2004 2005 2006 2007 23456980 89.2 90.5 87.8 90.3 87.0 7 85.6 82.6