Variance and standard deviation.Calculate the variance and the standard deviation of U.S. Treasury bills, long-term government bonds, and small-company stocks for 1950 to 1959, 1960 to 1969, 1970 to 1979, and 1980 to 1989 from Table 8.1. Which had the highest variance? Which had the lowest variance? Click on the Spreadsheet Learning Aid to see Table 8.1long dash Year-by-Year Returns, 1950-1999. Hint: Make sure to round all intermediate calculations to at least seven (7) decimal places. The input instructions, phrases in parenthesis after each answer box, only apply for the answers you will type. What is the variance of U.S. Treasury bills for 1950 to 1959, 1960 to 1969, 1970 to 1979, and 1980 to 1989? The variance of U.S. Treasury bills for 1950 to 1959 is nothing %. (Round to five decimal places.)