请解,大神

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收藏|2021/12/31 19:16

满意回答

2021/12/31 19:31

0.3 * ( 20% - 14% )^2 + 0.6 * ( 15% - 14% )^2 + 0.1 * ( -10% - 14% )^2= 0.3 * 0.06^2 + 0.6 * 0.01^2 + 0.1 * 0.24^2=0.0069= 0.69% 。

寂园晓月

其他回答(2)
  • 0.3*(20%-14%)²+0.6*(15%-14%)²+0.1(-10%-14%)²=0.3×(6/100)²+0.6×(1/100)²+0.1×(24/100)²=(10.8+0.6+57.6)/10000=69/10000=0.0069
    回答于 2021/12/31 20:11
  • 0.3×(20%-14%)²+0.6×(15%-14%)²+0.1×(-10%-14%)²=0.3×0.06²+0.6×0.01²+0.1×(-0.24)²=0.3×0.0036+0.6×0.0001+0.1×0.0576=0.00108+0.00006+0.00576=0.0069
    回答于 2021/12/31 20:04
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