The Normal Distribution Is a Theoretical Distribution for a Population

Multiple Choice

The normal distribution is a theoretical distribution for a population. The distribution can be used to estimate how risky a cash flow or return is. If the mean is 12% and the standard deviation is 22.6%, what is the range of possible returns for a 2 standard deviation change and what percentage of all observations would fall within 2 standard deviations?

A) 24%, 68%.
B) 24%, 96%.
C) 90%, 68%.
D) 90%, 96%.