A time-series plot of college students€™ average spending (in dollars) on course materials is shown in Fig. 56.

a. Estimate the average spending on course materials in 2009.
b. Estimate when the average annual spending on course materials was $640.
c. Estimate the change in average annual spending on course materials from 2012 to 2013.
d. Has the average annual spending on course materials generally increased, stayed approximately constant, generally decreased, or none of these from 2007 to 2013?
e. Textbook prices have increased an average of 6% per year for the past decade. State at least two possible reasons how college students€™ average spending on course materials could generally decrease while textbook prices increase.

Transcribed Image Text:

Years versus Average Spending 710 690 670 650 630 610 2007 2008 2009 2010 2011 2012 2013 Year