The chances of being audited by the Internal Revenue Service (IRS) are shown in Table 38 for various years.
Table 38
Tax Audit Rates
Tax Audit Rate
(number of audits per
Year 1000 tax returns)
2001 …………………….. 5.8
2003 …………………….. 6.5
2005 …………………….. 9.7
2007 …………………….. 10.3
2009 …………………….. 10.3
2011 …………………….. 11.1
2013 …………………….. 9.6
a. Find the change in the tax audit rate from 2001 to 2003.
b. Find the change in the tax audit rate from 2011 to 2013.
c. For which two-year period was the change in the tax audit rate the most? What was that change?