Using the data in the following table, and the fact that the correlation of A and B is 0.58, calculate the volatility (standard deviation) of a portfolio that is 50% invested in stock A and 50% invested in stock B. (Click on the following icon 2 in order to copy its contents into a spreadsheet.) Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B - 5% 18% 11% 33% 4% 11% - 10% -4% 4% 10% 14% 24% The standard deviation of the portfolio is %. (Round to two decimal places.)