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which option should i select

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Manager
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Joined: 22 Sep 2008
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which option should i select [#permalink]

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New post 29 Sep 2008, 10:27
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

question:what was the number of defective pen in ashipment of 4000 pens?

a: in a particular sample of 10 pen selected from the shipment ,1was defective

b: in a particular sample of 100pen selected from the shipment ,3 were defective


individually a and b is suff. to answer but if we combine both then we will be in dilema.

what is right way in this type of questions?

Thanks
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Re: which option should i select [#permalink]

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New post 29 Sep 2008, 11:00
vr4indian wrote:
question:what was the number of defective pen in ashipment of 4000 pens?

a: in a particular sample of 10 pen selected from the shipment ,1was defective

b: in a particular sample of 100pen selected from the shipment ,3 were defective


individually a and b is suff. to answer but if we combine both then we will be in dilema.

what is right way in this type of questions?

Thanks


Answer should be E.

Its just a sample .. so you can't generalize to find the exact number in 4000 pens

In 100 --1 defective
take another 100 sample -- there can be 0 defective.. 2 defective.. we don't know.
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Re: which option should i select [#permalink]

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New post 29 Sep 2008, 11:17
vr4indian wrote:
question:what was the number of defective pen in ashipment of 4000 pens?

a: in a particular sample of 10 pen selected from the shipment ,1was defective

b: in a particular sample of 100pen selected from the shipment ,3 were defective


individually a and b is suff. to answer but if we combine both then we will be in dilema.

what is right way in this type of questions?

Thanks


I believe this Q is wrong. The answers from A & B will not contradict each other.

Whether we can generalize from a sample or not is a different thing. If that's what this Q is testing, I don't know what to say. There have been other Q's where we do the math based on such wording. If 2 out of 10 are good, 20 out of 100 are good. Now, Is that sampling?? I believe so.
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Re: which option should i select [#permalink]

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New post 29 Sep 2008, 11:29
I agree with x2suresh. This question should be taken purely in literal meaning without any extrapolation based on results from the sampling.

E should be the answer.
Re: which option should i select   [#permalink] 29 Sep 2008, 11:29
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