Suppose we have the following returns for large-company stocks and Treasury bills over a six-year period:

Year	Large Company	US Treasury Bill
1	3.98%	4.56%
2	14.33	4.92
3	19.17	3.84
4	14.51	6.98
5	32.00	5.22
6	37.41	5.36

a. Calculate the arithmetic average returns for large-company stocks and T-bills over this period.

b. Calculate the standard deviation of the returns for large-company stocks and T-bills over this period.

c-1 Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the average risk premium over this period?

c-2.	Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the standard deviation of the risk premium over this period?