waterline

1.

[(0.75*0.05)^2+(0.25*0.04)^2+2*0.75*0.25*0.05*0.04*0.75]^0.5=(0.001406+0.0001+0.000563)^0.5=4.55%

 

2.

Expected rate of return=-10%x0.2-5%x0.3+10%x0.4+25%x0.1=-0.02-0.015+0.04+0.025=3%

-〉Variance=0.2*(-10%-3%)^2+0.3*(-5%-3%)^2+0.4*(10%-3%)^2+0.1*(25%-3%)^2

                =0.34%+0.19%+0.2%+0.48%=1.21%如果不加pctg符号的话，应该x1000，则为答案121

和notes哪里不一样呢？