The Dow Jones Industrial Average had the following annual returns:
Year Return
2012 7.3%
2013 26.5%
2014 7.5%
2015 -2.2%
2016 13%
Using just these last 5 years of data, what is the expected return for the Dow Jones? What is the standard deviation of the returns? Please show and explain your work.
Walk me through this problem step by step or write the formula with the numbers filled in.