Using the data in the following table, and the fact that the correlation of A and B is 0.19, calculate the volatility (standard deviation) of a portfolio that is 50% invested in stock A and 50% invested in stock B Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B - 13% 27% 18% 24% 8% 12% -7% -7% 5% -4% 9% 23% The standard deviation of the portfolio is %. (Round to two decimal places)