记:F0为发0,F1为发1,S0为收0,S1为收1
则:P(F0)=0.8 P(F1)=0.2 P(S0|F0)=0.8 P(S0|F1)=0.3
求:P(F0|S0)
解:P(S0)=P(S0F0)+P(S0F1)
=P(F0)P(S0|F0)+P(F1)P(S0|F1)
=0.8*0.8+0.2*0.3=0.7
P(F0|S0)=P(S0F0)/P(S0)
=0.8*0.8/0.7=0.9143
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