give the exact answer, make sure the answer is not (10.55%) cuz its wrong

ill rate

Using the data in the following table, and the fact that the correlation of A and B is 0.49, calculate the volatility (standard deviation) of a portfolio that is 50% invested in stock A and 50% invested in stock B. Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B -4% 25% 14% 27% 9% 6% -6% -6% 1% - 14% 10% 26% The standard deviation of the portfolio is %. (Round to two decimal places.)