Hey out there! Would greatly appreciate some help on this problem!

When inputting an answer, round your answer to the nearest 2 decimal places (for VARIANCE round to 4 decimal places). If you need to use a calculated number for further calculations, DO NOT round until after all calculations have been completed. For the final answer, Round to 2 decimal places (for VARIANCE round to 4 decimal places).

A stock has an expected return of 18.36% and a standard deviation of 11.40%. For this stock, what are the:

a) Upper range of 68% confindence interval

b) Lower range of 68% confindence interval:

c) Upper range of 95% confindence interval:

d) Lower range of 95% confindence interval:

e) Upper range of 99% confindence interval:

f) Lower range of 99% confindence interval: