Q8) A stock has an expected retum of 8.16% and a standard deviation of 18.78%. Compute the following for this stock: a) Upper range of 68% confindence interval : (0.5 points ) b) Lower range of 68% confindence interval : ( 0.5 points) e) Upper range of 95% confindence interval : ( 0.5 points) d) Lower range of 95% confindence interval : (0.5 points) c) Upper range of 99% confindence interval : ( 0.5 points) ff Lower range of 99% confindence interval: ( 0.5 points)