Four question help

9-7 Risk versus Return Rank the following three stocks by their risk-return relationship, best to worst. Rail Haul has an average return of 12 percent and standard deviation of 25 percent. The average return and standard deviation of Idol Staff are 15 percent and 35 percent; and of Poker-R-Us are 9 percent and 20 percent.

9-8 Risk versus Return Rank the following three stocks by their risk-return relationship, best to worst. Night Ryder has an average return of 13 percent and standard deviation of 29 percent. The average return and standard deviation of Whole Mart are 11 percent and 25 percent; and of Fruit Fly are 16 percent and 40 percent.

9-15 Average Return The past five monthly returns for Kohls are 4.11 percent, 3.62 percent, 1.68 percent, 9.25 percent, and 2.56 percent. What is the average monthly return?

10-8 CAPM Required Return Nanometrics, Inc., has a beta of 3.15. If the market return is expected to be 10 percent and the risk-free rate is 3.5 percent, what is Nanometrics required return?