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  • The result of an experiment or trial is called an outcome. 
  • An event for an experiment is the collection of outcomes of the experiment. 
  • The empirical (or experimental) probability P(E) of an event E is given by
  •        P (E) =

  • The probability of an event is never less than zero or greater than one
  • In an experiment, the sum of all probabilities is 1. For example , if E1 , E2 , E
  • are the outcomes of a trial, then P(E1)+P(E2)+P(E3) = 1 
  • The probability of an impossible event is 0. 
  • The probability of an event that is certain to occur is 1.

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