Consider the tollowing rates of return: a. Calculate the arithmetic average returns for large-company stocks and T.blils over this period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.9. 32.16.) b. Calculate the standard deviation of the returns for lorge-company stocks and T-bills over this period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.9., 32.16.) o-1Calculate the observed risk premium in eoch year for the large-compeny stocks versus the T-bills. What was the orithmetic average risk premium over this period? (A) negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, eg. 32.16.) c.2Calculate the observed risk premlum in each year for the large-company stocks versus the T-bills. What was the atandord deviation of the risk premium over this period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9, 32.16.)