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新《课标》增加了条件概率的内容,一般地,设A,B为两个事件,且P(A)>0,称P(B|A)=P(AB)/P(A)为在事件A发生的条件下,事件B发生的条件概率(conditional probability).
In the new “course standard”, the conditional probability is added. Generally, let A and B be two events, and P (A)> 0 and P (B | A) = P (AB) / P The conditional probability that event B occurs under the condition that event A occurs.