The annual averages of the discount rate, federal funds rate, and the prime rate for the years 1977-1996 are given in the file P2_30.XLS. For each of these three key interest rates, determine the following:

a. Thirty percent of all years in the sample period have annual average rates that exceed what value?

b. Twenty-five percent of all years in the sample period have annual average rates that are less than or equal to what value? c What is the most typical annual average rate over the given sample period?