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Probability: Definitions

  • A probability experiment involves performing a number of trials to enable us to measure the chance of an event occurring in the future. A trial is a process by which an outcome is noted
  • Examples of Definitions:
    • Experiment: Roll a die two hundred times noting the outcomes
    • Event of interest: A six faces upwards
    • Trial:  Roll the die once
    • Number of trials: 200
    • Outcomes: 1, 2, 3, 4, 5 or 6
  • Probability of an event to occur is defined as number of cases favorable for the event, over the number of total outcomes possible in unbiased experiment
    • For example, if the event is "occurrence of an even number when a die is rolled“
    • The probability is given by 3/6 = 1/2, since 3 faces out of the 6 have even numbers
    • and each face has the same probability of appearing

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