參考答案

甲項(xiàng)目的預(yù)期收益率=30%×0.2+32%×0.6+24%×0.1+4%×0.1=28%
乙項(xiàng)目的預(yù)期收益率=40%×0.2+20%×0.6+10%×0.1-10%×0.1=20%
甲項(xiàng)目收益率的標(biāo)準(zhǔn)差

=13.42%
甲項(xiàng)目收益率的標(biāo)準(zhǔn)離差率=8.34%/28%=0.30
乙項(xiàng)目收益率的標(biāo)準(zhǔn)離差率=13.42%/20%=0.67