Here is another question that I didn't understand. I did 1/2 but I don't know how to get the other part of the problem

"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" (Cornett et al., 2019, p. 281).

Before solving this problem, calculate the coefficient of variation. Show the coefficient of variation you have calculated for each stock.

I have the COV for each

• Rail Haul is 2.083
• Idol Staff is 2.222
• Poker-R-Us is 2.333

I don't know how to find the risk-return relationship, best to worst.

please help me with the formula. thank you

jenn