答案选A,求计算过程,麻烦了
展开全部
是几何平均值,不是算术平均值。
设2000年初,股票价格x,则期末价格(1+4.5%)x
2001年末价格(1+4.5%)(1+2.1%)x
2002年末价格(1+4.5%)(1+2.1%)(1+25.5%)x
2003年末价格(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)x
平均收益率=y
则(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)x=(1+y)^4×x
1+y=[(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)]^(1/4)
y=[(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)]^(1/4)-1
=8.079%
设2000年初,股票价格x,则期末价格(1+4.5%)x
2001年末价格(1+4.5%)(1+2.1%)x
2002年末价格(1+4.5%)(1+2.1%)(1+25.5%)x
2003年末价格(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)x
平均收益率=y
则(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)x=(1+y)^4×x
1+y=[(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)]^(1/4)
y=[(1+4.5%)(1+2.1%)(1+25.5%)(1+1.9%)]^(1/4)-1
=8.079%
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