Using the data in the following table, and the fact that the correlation of A and B is 0.31, calculate the volatility (standard deviation) of a portfolio that is 60% invested in stock A and 40% invested in stock B. Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B - 12% 28% 19% 36% 9% 2% -7% -9% 4% -9% 10% 23% The standard deviation of the portfolio is 11.13 %. (Round to two decimal places.)