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The answer depends on the context and also whether it is upper or lower case.

f can refer to

  • the frequency of an outcome in repeated trials,
  • the probability distribution function for a continuous variable.

F can refer to

  • the cumulative distribution function for a continuous variable,
  • Fisher's F-distribution which, in the form of Fisher's F-statistic is used for comparing variances.

There are probably other meanings.

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Q: What does the letter f mean in probability?
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