Exponential distribution

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Typical exponential distribution curves

The exponential distribution is a probability distribution. It is only used on the positive real numbers. Its main use is to assess the duration of random time intervals. Examples where it can be used:

  • Duration of a telephone call
  • How long does it take to perform a service, fix something at a service point etc.
  • Duration between two phone calls
  • Half life of atoms (radioactive decay)
  • Expected lifetime of electronic (or other) parts, if wearing is not considered (this is called Mean Time Between Failures, MTBF)
  • Age of plants or animals
  • Very simple model used by insurance companies

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