how to solve this one

Problem 19 Intro The table below shows the historical rates of return (including dividends) for two stocks: Year Stock A Stock B 2020 4% -3% 2019 12% 20% 2018 8% 20% 2017 4% -12% Stock A makes up 50% of the value of portfolio, and stock B makes up the rest. Calculate the portfolio return for each year. Attempt 7/10 for 10 pts. Part 4 What was the annual standard deviation of portfolio returns? Previous answers: 8.546%; il 0.007303; 0.0854567; 0.256; 6.97%; 0.0567 Submit