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Consider the following table for a period of six years: a-1. Calculate the arithmetic average retums for large-company stocks and T-bills over this time period. Note: Do not round intermediate colculations and enter your answers as a percent rounded to 2 decimal ploces, e.g., 32.16. a-2. Calculate the standard deviation of the returns for large-company stocks and T-bills over this time period. Note: Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal ploces, e.g., 32.16. iote, wo not rounc intermediate calculations ana enter your answers as a percent rouncea to