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

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- 1 month ago
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))

- davidLv 71 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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