Question

概率论与数理统计 各位高手帮忙做一下!

Answer 1

设调整成功为事件A,合格品为事件B.

P(A|B)=P(AB)/P(B)

P(AB)=P(A)P(B|A)=75%×90%

P(B)=P(A)P(B|A)+P(A拔)P(B|A拔)=75%×90%+25%×30%

代入求出P(A|B)得,P（A/B）=0.75