Table 9.2 Average Returns for T-bills Table 9.4 Annual Standard Deviation for T-Bills Use the tables above to calculate the coefficient of variation of the risk-return relationship in T-bills during each decade since 1950. Note: Round your answers to 2 decimal places. Use the tables above to calculate the coefficient of variation of the risk-return relationship in T-bills during each decade since 1950. Note: Round your answers to 2 decimal places