13.68% is incorrect.

Using the data in the following table, and the fact that the correlation of A and B is 0.43, calculate the volatility (standard deviation) of a portfolio that is 60% invested in stock A and 40% 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 -8% 26% 16% 27% 9% 15% -9% -9% 2% -7% 13% 15% The standard deviation of the portfolio is %. (Round to two decimal places.)