You are analyzing the historical performance of a stock. The annual returns for the last ten years are shown below. Year Ann Ret 2018 12% 2017 9% 2016 5% 2015 3% 2014 13% 2013 6% 2012 20% 2011 0% 2010 6% 2009 14% Calculate the average annual return, the variance and standard deviation of this stock over the tenyear period.