Please solve only part 5 urgently!

The following table shows realized rates of return for two stocks. Part 1 (w) Attempt 1/10 for 10 pts What is the arithmetic average return for stock B? Correct What is the arithmetic average return for stock B ? Correct Part 2 ( Attempt 2/10 for 10 pts. What is the variance for stock B ? Correct Part 3 Attempt 4/10 for 10 pts. What is the covariance of returns? Correct Part 4 Attempt 1/10 for 10 pts. What is the mean return of a portfolio with 20% invested in stock A and the remainder in stock B (assuming annual rebalancing)? Correct What is the standard deviation of a portfolio with 20% invested in stock A and the remainder in stock B (assuming annual rebalancing)