Problem 16 how do you find the standard deviation? How do you do problems 17 and 18?

Use the following information to answer questions 25 through 27. ReturnStandard Risk Free Risky Asset 14% 12.6% Deviation 10% 24.3% 16, What is the return and standard deviation of a portfolio with 30% in the risk free asset 17, What is the return and standard deviation of a portfolio with 60% in the risk free asset 18, what is the return and standard deviation of a portfolio with 135% in the risky asset? and 70% in the risky asset? and 40% in the risky asset? Use the following information to answer questions 19 through 21. Return Standard Corr(D,E) Deviation