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请问廖老师

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#1 Created at ... [Delete] [Delete and Lock User]

(99+1998)/100000=2.097%。

上述计算方式可以这样算吗  

0.1%*99%+99.9%*2%

患病阳了联合概率,加上没患病假阳的联合概率。等于阳的总概率。


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