Please show work. Thank you for your time

Using the data in the following table, calculate the volatility (standard deviation of a portfolio that is 67% invested in stock A and 83% in stock B. The volatility of the portfolio is % (Round to two decimal places) Data table (Click on the following icon Year 2010 Stock A -7% Stock 16% order to copy its contents into a spreadsheet.) 2011 2012 2013 2014 17% 5% 10% 5%. 40% 10% -7% - 13% 2015 85 22% Print Done