- #1

glebovg

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- Thread starter glebovg
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- #1

glebovg

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- #2

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What have you tried?

- #3

cmb

- 1,128

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I'm getting the feeling that there isn't enough information here. I think the term "probability that one 3 foot section of wire is defective is 0.002" could be interpreted in a number of ways.

- #4

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I agree it is pretty ambiguous. But one could assume we are talking about dividing the wire into 150 separate 3 foot sections and interpret it that way just to have something to talk about.

- #5

glebovg

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That is exactly what I think. At first I thought that X~Pois(λ) and that P(X=1)=0.002. But finding λ seems impossible and even the values you find do not make any sense.

- #6

glebovg

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Perhaps X~Bin(150, 0.002).

- #7

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Perhaps X~Bin(150, 0.002).

That's what I would try (making an independence assumption).

- #8

Ray Vickson

Science Advisor

Homework Helper

Dearly Missed

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Well, you have a large N, small p version of the binomial, with m = N*p "moderate", so I think a Poisson approximation should be very good, indeed.

RGV

- #9

glebovg

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Thank you.

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