Reliability

Which distribution, often used in reliability data analysis, can represent early-failure, random-failure and wear-out types depending on its shape parameter?

  1. AWeibull distribution
  2. BUniform distribution
  3. CBinomial distribution
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Answer: A. Weibull distribution

In the Weibull distribution, a shape parameter m less than 1 represents the early-failure type, with failure rate decreasing over time; m = 1 represents the constant random-failure type; and m greater than 1 represents the wear-out type, with failure rate increasing. Failure data are plotted on Weibull probability paper and the like to estimate failure trends and lifetime.

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