Fill in the missing information in the following table. Assume that Portfolio AB is 50 percent invested in Stock A. Note: 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. Year 2018 2019 2020 2021 2022 Average return Standard deviation Annual Returns on Stocks A and B Stock A Stock B Portfolio AB 14.5 % 22.5 % % 34.4 % -34.1 % % -15.8 % 44.1 % % 24.7 % 17.3 % % 15.6 % 27.9 % % % % % % % %