The following table shows the nominal returns on U.S. stocks and the rate of inflation

Year	Nominal Return (%)	Inflation (%)
2010	12.0	4.0
2011	6.8	3.4
2012	15.7	2.9
2013	7.1	4.4
2014	-44.0	.3

a. What was the standard deviation of the nominal market returns? (Do not make the adjustment for degrees of freedom described in footnote 18.) (Use decimals, not percents, in your calculations. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)