Assume these are the stock market and Treasury bill returns for a 5-year period:

YearStock Market Return T-Bill Return

Year 135.63 3.20

Year 230.60 1.60

Year 315.26 .22

Year 42.48 .07

Year 518.56 .09

a.What was the risk premium on common stock in each year?(Negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)

YearRisk premium

Year 1 %

Year 2 %

Year 3 %

Year 4 %

Year 5 %

b.What was the average risk premium?(Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)

Average risk premium%

c.What was the standard deviation of the risk premium?(Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)

Standard deviation%