Let's say Tim invested 45% of his money to buy ABC Corp.s shares and the remaining 55% of his money to buy DEF Corp.s shares in 2015. From 2016 to 2019, ABC Corp. generated the total return percentage of 15%, -5%, 20%, -6%. DEF Corp. generated the total return percentage of 10%, 8%, -5%, and 9% during the same time period. What was the average rate of return for the portfolio (plain English: Tims investment as a whole) from 2016 to 2019? Group of answer choices 6.73% 2.56% 5.50% 5.73%

Same facts as above. What was the portfolio's standard deviation? Group of answer choices 6.69% 4.75% 4.81% 5.14%