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Binomial distribution and probability problem

  • Thread starter the_d
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  • #1
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Homework Statement



A population has an average of 12 defects per 100 feet of wire sampled and inspected. What is the probability of finding 20 or fewer defects in a sample?


Homework Equations



I think im supposed to use the binomial distribution b(x;n,p)


The Attempt at a Solution



Where should i look to start?
 
Last edited:

Answers and Replies

  • #2
statdad
Homework Helper
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If you want to use the binomial distribution you need a sample size, do you not? You don't have one here.
What distribution do you know of that refers to the mean number of items per (area, length, volume, time)?
 

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