(1)期望收益:60*0.2+40*0.5+20*0.3=12+20+6=38万元(2)期望收益率:繁荣r1=60/200=30%,一般r2=40/200=20%,潇条r3=20/200=10%期望收益率=30%x0.3+20%x0.5+10%x0.2=0.09+0.1+0.02=0.21=21%标准差u=√((30%-20%)^2x0.2+(20%-20%)^2x0.5+(20%-10%)^2x0.3) =√(0.002+0+0.003)=0.0707=7.07%