Using the data in the following table, :, calculate the volatility (standard deviation) of a portfolio that is 58% invested in stock A and 42% in stock B. The volatility of the portfolio is %. (Round to two decimal places.) X i - Data Table (Click on the following icon in order to copy its contents into a spreadsheet.) Year 2013 Stock A Stock B 2010 -9% 29% 2011 12% 8% 2012 10% 4% - 1% -4% 2014 1% - 13% 2015 7% 19%