Average return Standard Deviation 12.1 % Series Large-company stocks Small-company stocks Long-term corporate bonds Long-term government bonds Intermediate-term government bonds U.S. Treasury bills Inflation 19.8% 31.7 16.5 6.4 8.3 6.0 9.9 5.2 5.6 3.4 3.1 3.0 4.0 a. What range of returns would you expect to see 68 percent of the time for long-term corporate bonds? (A negative answer should be indicated by a minus sign. Enter your answers from lowest to highest. Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) b. What about 95 percent of the time? (A negative answer should be indicated by a minus sign. Enter your answers from lowest to highest. Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) % %to a. Expected range of returns b. Expected range of returns to LO