Let's say Tim invested 55% of his money to buy ABC Corp.s shares and 45% of his money to buy DEF Corp.s shares in 2016. From 2017 to 2020, ABC Corp. generated the total return percentage of 11%, 11%, 12%, 11.5%. DEF Corp. generated the total return percentage of -10%, 22%, -8%, and 19% during the same time period. What was the average rate of return for the portfolio (plain English: Tims investment as a whole) from 2017 to 2020?

Group of answer choices

8.84%

9.85%

10.48%

11.92%

Same facts as above: what is the standard deviation of the portfolios returns from 2017 to 2020?

Group of answer choices

5.63%

8.00%

7.62%

8.28%