Before buying a batch of 100 fuses a man tests 4 of these . If the batch contains 10 defective fuses . What is the probability ?

2 Answers

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  • What's the probability of getting none?

    ((90C4) / (100C4)) * ((10C0) / (96C0))

    That 1 is defective?

    ((90C3) / (100C3)) * ((10C1) / (97C1))

    That 2 are defective?

    ((90C2) / (100C2)) * ((10C2) / (98C2))

    That 3 are defective?

    ((90C1) / (100C1)) * ((10C3) / (99C3))

    That 4 are defective

    ((90C0) / (100C0)) * ((10C4) / (100C4))

  • david
    Lv 7
    1 month ago

    inomplete question ...   What is the probability ???  that none of the tested fuses is defective??

         96/100  X  96/99  X  96/98  X  96/97  =  0.90251

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