Suppose we have the following retums for large-company stocks and treasury bills over a six-year period: 0. Calculate the arithmetic average returns for large-company stocks and T-bills over this period. (Do not round intermediote colculotions ond enter your answers as a percent rounded to 2 decimal places, e.g. 32.16.) b. Calculate the standard devation of the returns for large-company stocks and T-bills over this period. (Do not round intermediote calculations and enter your answers os o percent rounded to 2 decimal pleces, e.g., 32.16.) c-1. Calculate the observed risk premium in each year for the large-compary stocks versus the T.bills. What was the average risk premium over this petiod? (A negative onswer should be indicoted by a minus sign. Do not round intermediote calculations ond enter your answer as o percent rounded to 2 decimal piaces. e.9., 32.16) c-2. Calculate the observed risk premium in each year for the large-compary stocks versus the T-bilk. What was the standard deviation of the risk premurn over this period? (Do not round intermediote colculotions and enter your answer as a percent rounded to 2 decimal places, e.g.. 32.16.)