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. Realized Returns Year Stock A Stock B 2008 -10% 21% 2009 20% 30% 2010 5% 7% 2011 -5% -3% 2012 2% -8% 2013 9% 25% The standard deviation of the portfolio is%. (Round to two decimal places.)