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

Year		Stock Market Return (%)			T-Bill Return (%)
2013			35.60			0.20
2014			15.10			0.20
2015			5.00			0.20
2016			16.70			0.07
2017			25.50			0.09

Required:

a. What was the risk premium on common stock in each year? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)

b. What was the average risk premium?

c. What was the standard deviation of the risk premium? (Ignore that the estimation is from a sample of data.)