The table below shows the historical rates of return (including dividends) for two stocks: Stock A makes up 80% of the value of portfolio, and stock B makes up the rest. Calculate the portfolio return for each year. Part 1 Attempt 1/10 for 10p What was the portfolio return in 2021 ? Part 2 Attempt 1/10 for 10p What was the portfolio return in 2020 ? What was the average annual portfolio return over all years? Part 4 What was the annual standard deviation of portfolio returns