Suppose that the expected return for stock Y is 15% and the standard deviations of those returns is 12%. The expected return and standard deviation for stock Z is 22% and 10%, respectively. All risk averse investors would choose stock Z over stock Y if they had to pick one to hold in isolation. True False Use the following to answer the next two questions. Find the arithmetic mean return of this investment. Round intermediate steps and your final answer to four decimals. Enter your answer in decimal format (EX: XXXX). Approximately two thirds of the time, you would expect your return to be no higher than _____. Round intermediate steps and your final answer to four decimals. Enter your answer in decimal format (EX: XXXX)