Using the data in the following table, and the fact that the correlation of A and B is 0.62, calculate the volatility (standard deviation) of a portfolio that is 70% invested in stock A and 30% invested in stock B. Realized Returns Stock A Stock B Year 2008 2009 2010 2011 2012 2013 -2% 17% 5% 10% 5% 6% 19% 33% 11% -2% -7% 27% The standard deviation of the portfolio is %. (Round to two decimal places.)