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29 Sep 2008, 11:27
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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
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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29 Sep 2008, 12:00
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vr4indian
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.
29 Sep 2008, 12:17
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vr4indian
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.
