Using Probability Distributions Suppose the returns on long-term corporate bonds and T-bills are normally distributed. Based on the historical record, use the NORMDIST function in Excel ® to answer the following questions:

a. What is the probability that in any given year, the return on long-term corporate bonds will be greater than 10 percent? Less than 0 percent?

b. What is the probability that in any given year, the return on T-bills will be greater than 10 percent? Less than 0 percent?

c. In 1979, the return on long-term corporate bonds was −4.18 percent. How likely is it that this low of a return will recur at some point in the future? T-bills had a return of 10.56 percent in this same year. How likely is it that this high of a return on T-bills will recur at some point in the future?