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harmonic mean的含同geomitric mean如何不同NO.PZ2015120604000058问题如下The returns of the investor'investment over past 3years are 7%, 8%,9% Calculate the harmonic meof the return. .A.8.0.B.7.92.C.2.64.B is correctThe harmonic meXH=317+18+19=7.92{ X }_{ H }=\fr{ 3 }{ \fr{ 1 }{ 7 } +\fr{ 1 }{ 8 } +\fr{ 1 }{ 9 } } =7.92XH=71+81+913=7.92 请问为什么不是3/(1/7%+1/8%+1/9%)?
NO.PZ2015120604000058问题如下 The returns of the investor'investment over past 3years are 7%, 8%,9% Calculate the harmonic meof the return. .A.8.0.B.7.92.C.2.64.B is correctThe harmonic meXH=317+18+19=7.92{ X }_{ H }=\fr{ 3 }{ \fr{ 1 }{ 7 } +\fr{ 1 }{ 8 } +\fr{ 1 }{ 9 } } =7.92XH=71+81+913=7.92 如题,请老师帮忙解答一下谢谢!
NO.PZ2015120604000058 7.92. 2.64. B is correThe harmonic meXH=317+18+19=7.92{ X }_{ H }=\fr{ 3 }{ \fr{ 1 }{ 7 } +\fr{ 1 }{ 8 } +\fr{ 1 }{ 9 } } =7.92XH=71+81+913=7.92 如题,请老师指导,谢谢
NO.PZ2015120604000058 7.92. 2.64. B is correThe harmonic meXH=317+18+19=7.92{ X }_{ H }=\fr{ 3 }{ \fr{ 1 }{ 7 } +\fr{ 1 }{ 8 } +\fr{ 1 }{ 9 } } =7.92XH=71+81+913=7.92 分子的3是3年还是3元?
NO.PZ2015120604000058 老师能一下为什么是除以7,不是1.07吗? 辛苦啦!谢谢老师们,比心!