est retur 11. Standard deviation. Calculate the standard deviation of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1990 to 1999 from Table 8.1. Which had the highest variance? Which had the lowest rovince? 1.99% 18.24% return 13.88% 1990 7.86% 7.13% -3.20% - 27.08% 5.65% 1991 18.39% 30.66% 3.54% 1992 7.79% 50.24% 27.84% 7.71% 2.97% 1993 15.48% 9.87% 20.30% 3.91% 1994 -7.18% 1.29% -3.34% 5.58% 1995 31.67% 37.71% 33.21% 5.50% 1996 -0.81% 23.07% 16.50% 5.32% 1997 15.08% 33.17% 22.36% 5.11% 1998 13.52% 28.58% -2.55% 4.80% 1999 -8.74% 21.04% 21.26% 5.02% 9.23% 18.99% 15.87% 1990s average return 5.23% 5.94% 14.89% 17.10% 50-year average return 2.98% 9.49% 16.70% 29.04% Standard deviation