Standard deviation. Calculate the standard deviation of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1988 to 1997 from Table 8.1. Which had the highest variance? Which had the lowest variance? Click on the Spreadsheet Learning Aid to see Table 8.1-Year-by-Year Returns, 1950-1999. What is the standard deviation of U.S. Treasury bills for 1988 to 1997? % (Round to three decimal places.) Standard deviation. Calculate the standard deviation of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1988 to 1997 from Table 8.1. Which had the highest variance? Which had the lowest variance? Click on the Spreadsheet Learning Aid to see Table 8.1-Year-by-Year Returns, 1950-1999. What is the standard deviation of U.S. Treasury bills for 1988 to 1997? % (Round to three decimal places.)