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