SOLUTION: A shipment at a department store has 40 alarm clocks. 4 of them are defective. If 6 alarm clocks are removed from the shipment at random, find the probability that four of them are

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Question 1042076: A shipment at a department store has 40 alarm clocks. 4 of them are defective. If 6 alarm clocks are removed from the shipment at random, find the probability that four of them are defective.

What is the correct next step: https://s32.postimg.org/rr6ulosw5/math_4_4.png (problem /w choices)
Found 2 solutions by Lillie28, stanbon:
Answer by Lillie28(13) About Me  (Show Source):
Answer by stanbon(75887) About Me  (Show Source):
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A shipment at a department store has 40 alarm clocks. 4 of them are defective. If 6 alarm clocks are removed from the shipment at random, find the probability that four of them are defective.
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Binomial Problem with n = 6 and p(defective) = 4/40 = 0.1
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P(x = 4) = 6C4*0.1^4*0.9^2 = binompdf(6,0.1,4) = 0.0012
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Cheers,
Stan H.