A stock has an expected return of 11.53% and a standard deviation of 16.08%. Compute the following for this stock:

a) Upper range of 68% confidence interval :

b) Lower range of 68% confidence interval :

e) Upper range of 95% confidence interval :

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)