Using the data in the following table, and the fact that the correlation of A and B is 0.43, 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 -3% 17% 8% 30% 5% 13% - 1% -7% 5% -8% 10% 21% The standard deviation of the portfolio is 8.28 %. (Round to two decimal places.)