Calculate the coefficient of variation of the risk-return relationship of the bond market (Use the above Tables) during each decade since 1950. (round your answer to 2 decimal places.) The past five monthly returns for PG&E are -3.49 percent, 4.68 percent, 4.09 percent, 6.95 percent, and 3.90 percent. Compute the standard deviation of PG&E's monthly returns. (Do not round Intermediate calculations and round your final answer to 2 decimal places.)