For instance, the mix of 77% bonds and 23% stocks
mp = (.77 x 5.6) + (.23 x 11.2) = 6.9%
When = 1 s2
p = .772 x 8.12 + .232 x 19.22 + 2 x
.77 x .23 (1 x 8.1 x 19.2) = 113.49
the portfolio volatility sp = 10.65
When = 0.13 s2
p = .772 x 8.12 + .232 x 19.22 +
2 x .77 x .23 (0.13 x 8.1 x 19.2) = 65.61
the portfolio volatility sp = 8.1
same volatility as bonds but better return