If we assume that the annual return on common stocks are normally distributed, then approximately 99% of the returns will fall within the range % if the average historical return is 6.1% with a standard deviation of 8.6%.

a) 2.5 to 14.7

b) 19.7 to 31.9

c) 0 to 14.7

d) 11.1 to 23.3

e) 11.1 to 31.9