Binomial distribution and probability problem

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SUMMARY

The discussion centers on calculating the probability of finding 20 or fewer defects in a sample of wire, given an average of 12 defects per 100 feet. Participants suggest using the binomial distribution formula b(x;n,p) for this calculation. However, the lack of a specified sample size raises questions about the appropriate distribution to use. The conversation highlights the need to clarify whether a binomial or Poisson distribution is more suitable for this scenario.

PREREQUISITES
  • Understanding of binomial distribution and its formula b(x;n,p)
  • Knowledge of Poisson distribution and its application to average rates
  • Familiarity with probability concepts and calculations
  • Basic statistical analysis skills
NEXT STEPS
  • Research the application of the Poisson distribution for problems involving average rates of occurrence
  • Learn how to calculate probabilities using the binomial distribution with specified sample sizes
  • Explore the relationship between binomial and Poisson distributions in statistical modeling
  • Practice solving probability problems involving defects and quality control metrics
USEFUL FOR

Students studying statistics, data analysts, and professionals in quality control or manufacturing who need to understand defect probabilities in sampled products.

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


The Attempt at a Solution



Where should i look to start?
 
Last edited:
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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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