Using the data in the following table, and the fact that the correlation of A and B is 0.48, calculate the volatility (standard deviation) of a portfolio that is 70% invested in stock A and 30% invested in stock B. (Click on the following icon in order to copy its contents into a spreadsheet.) Year 2008 2009 2010 2011 2012 Realized Returns Stock A Stock B - 10% 21% 20% 30% 5% 7% -5% -3% 2% -8% 9% 25% 2013 The standard deviation of the portfolio is %. (Round to two decimal places.)