You are choosing among three retirement funds. Alpha Fund has an expected return of 16% and a standard deviation of 9.5%. Beta Fund has an expected return of 33% and a standard deviation of 65%. Gamma Fund has an expected return of 14%. If according to the mean-standard deviation rule the Gamma Fund would never be chosen, then the Gamma Fund's standard deviation must be greater than what?

The correct answer is: Gamma Fund's standard deviation must be greater than 9.5%

How is the answer 9.5%, show all work in excel