A stock has an expected return of 6.6% and a standard deviation of 18.3%. What is the 68%, 95%, and 99% confidence interval for this stock? (Show your answer to the nearest 3 decimals) Upper range of 68% confindence interval: Lower range of 68% confindence interval: Upper range of 95% confindence interval: Lower range of 95% confindence interval: Upper range of 99% confindence interval: Lower range of 99% confindence interval