this is one question; if it isnt answered fully, it will be downvoted

Q4) A stock has an expected return of 05.15% and a standard deviation of 16.91%. For this stoc., what are the: a) Upper range of 68% confindence interval (0.5 points) b) Lower range of 68% confindence interval: (0.5 points) c) Upper range of 95% confindence interval: (0.5 points) d) Lower range of 95% confindence interval: (0.5 points) e) Upper range of 99% confindence interval: (0.5 points) f) Lower range of 99% confindence interval: (0.5 points)