Consider the following table for different assets for 1926 through 2017.

Series

Average return

Standard DeviationLarge-company stocks 12.1%19.8%Small-company stocks 16.531.7Long-term corporate bonds 6.48.3Long-term government bonds 6.09.9Intermediate-term government bonds 5.25.6U.S. Treasury bills 3.43.1Inflation 3.04.0a.What range of returns would you expect to see 68 percent of the time for large-company stocks?(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 decimalplaces, e.g., 32.16.)b.What about 95 percent of the time?