A stock has an expected return of 18.5% and a standard deviation of 14.7%. 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: