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發(fā)生概率30%,預(yù)期收益-10%;發(fā)生概率30%,預(yù)期收益6.7%;發(fā)生概率10%,預(yù)期收益30%;發(fā)生概率30%,預(yù)期收益50%;標(biāo)準(zhǔn)差怎么算?
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2022 10/23 16:33
家權(quán)老師
2022 10/23 16:39
平均值=-10%*30%%2b6.7%*30%%2b30%*10%%2b50%*30%=17.01%
標(biāo)準(zhǔn)差=((10%-17.01%)*30%%2b(6.7%-17.01%)*30%%2b(30%-17.01%)*10%%2b(50%-17.01%)*30%)^0.5=24.49%
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