1. (Chapter 10) You have observed the following returns on Sonora Data Corp.'s stock over the past 5 years:-21%, 6%, 21%, 15%, and 9%. a. What was the arithmetic average return on SDC's stock over this five-year period? b. What was the variance of SDC's returns over this period? The standard deviation? Now suppose the average inflation rate over this period was 2% and the average T-bill rate over the period was 3%. c. What was the average real return on SDC's stock? d. What was the average nominal risk premium on SDC's stock