Using the data in the following table, and the fact that the correlation of A and B is

0.51,

calculate the volatility (standard deviation) of a portfolio that is

60%

invested in stock A and

40%

invested in stock B.

	Realized Returns
Year	Stock A		Stock B
2008	6%		21%
2009	19%		27%
2010	1%		1%
2011	9%		8%
2012	5%		12%
2013	9%		33%

The standard deviation of the portfolio is

nothing%.

(Round to two decimal places.)