Returns for the Phillies and Dodgers companies over the last five years are shown below. a. Calculate the average return and Standard deviation of each of the firm's returns? (Hint: This is a sample, not a complete population; so the sample standard deviation formula should be used.) b. Now, calculate the average return and standard deviation of a portfolio, consisting of 70% Phillies and 30% Dodgers. Phillies Dodgers Portfolio Year Return Return Return 2022 26.00% 2021 20.00% 2020 12.50% 2019 12.00% 2018 9.00% 15.00% 20.00% -12.50% 4.00% 9.00%