lanlan2006 当前离线
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answer A
P(analysts)=130/200=13/20
P(Positive impact)=140/200=14/20
P(analyst and Positive impact)=100/200=10/20
P (Answer) = 13/20+14/20-12/20=7/20=0.35
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发表于 2006-8-7 04:20
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