Using the data in the following table, and the fact that the correlation of A and B is 0.73, calculate the volatility (standard deviation) of a portfolio that is 80% invested in stock A and 20% invested in stock B. (Click on the following icon in order to copy its contents into a spreadsheet.) Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B - 1% 16% 13% 26% 1% 13% -7% - 3% 1% -9% 12% 20% The standard deviation of the portfolio is %. (Round to two decimal places.)