Fill in the missing information in the following table. Please assume that Portfolio AB is 50 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.) Please help me figure this out! Thanks

Annual Returns on Stocks A and B Year Stock A Stock B Portfolio AB 2015 11% 21 % % 2016 37 % -38% % 2017 -21 % 48 % % 2018 26% 16 % % 2019 13 % 24 % % Average return % % % Standard deviation % % %