SOLUTION: A shipment of 9 typewriters contains 3 that are defective.Find the probability that a sample of size four, drawn from the nine, will not contain a defective typewriter.

Question 507256: A shipment of 9 typewriters contains 3 that are defective.Find the probability that a sample of size four, drawn from the nine, will not contain a defective typewriter.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A shipment of 9 typewriters contains 3 that are defective.Find the probability that a sample of size four, drawn from the nine, will not contain a defective typewriter.
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Binomial Problem with n = 4 and P(defect) = 1/3 : p(no defect) = 2/3
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P(4 will not contain a defective) = 1 - P(all good) = 1 - 6C4/9C4
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= 1 - 0.1190
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= 0.8810
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Cheers,
Stan H.
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