Using the data in the following table, and the fact that the correlation of A and B is 0.29, 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 o in order to copy its contents into a spreadsheet.) Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B -9% 15% 9% 34% 5% 2% - 1% - 1% 3% - 3% 7% 15% The standard deviation of the portfolio is %. (Round to two decimal places.)