<PRE><B>Question 581390</B>
Suppose that a company determines if it will accept a shipment of 15 items by sampling 5 of the items for close inspection. Suppose that 4 of the items in the shipment are defective.
Referring to Defective, find the standard deviation of the number of defective items.
I think the way to do this problem is npq to get the variance and then find the square root to get the standard deviation. (5)(.8)(.2)=.8 then the square root is .8944
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Binomial with n = 5 and p(defect) = 4/15 and p(not defect) = 11/15
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std = sqrt(npq) = sqrt(15*(4/15)(11/15)) = 1.7127

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Cheers,
Stan H.
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