Math- probability

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Suppose 80% of kids who visit a doctor have a fever, and 30% of kids with a fever have sore throats. What's the probability that a kid who goes to the doctor has a fever and a sore throat? Round to three decimal places.

  • Math- probability -

    F=fever
    S=sore throat

    P(F)=80%
    P(S|F)=30%

    But
    P(S|F)=P(S∩F)/P(F)
    P(S∩F)=P(S|F)*P(F)=30%*80%=0.24

  • Math- probability -

    .24

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