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December 23rd, 2009, 02:28 AM   #1
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Hyp distribution question

A tutor is checking a practicant's work (declarations) and chooses 3 out of 12 declarations. There are 2 faulty ones.
N=12, n=3 S=2

P(X=0) = 12/22 P(X=1) = 9/22 P(X=2) = 1/22


How many declarations must the tutor check, in order for his probability to find at least one faulty declaration to be at least 2/3?
Btw, answer in book says n>=5, any help?
allan89a is offline  
December 23rd, 2009, 02:10 PM   #2
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Re: Hyp distribution question


The book is right. For five picks we can get 2 wrong 3 right or 1 wrong 4 right.

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