Please Calculate Standard Deviation and show in Excel

Fill in the missing information in the following table. Assume that Portfolio AB is 60 percent invested in Stock A. (A negative value should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Answer is complete but not entirely correct. % Annual Returns on Stocks A and B Stock A Stock B 14.0 22.0 % 34.2 (33.8) % (15.4) 43.8 24.6 17.4 15.8 28.2 % 14.64 15.52 0.00 0.00 % Year 2012 2013 2014 2015 2016 Average return Standard deviation % Portfolio AB 17.20 7.00 8.28 21.72 20.76 14.99 0.00