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QUESTION

What is a characteristic of the mass function of a discrete random variable X ?

What is a characteristic of the mass function of a discrete random variable X?

  1. The sum of probabilities  over all possible values x is 1.
  2. For every possible value x, the probability   is between 0 and 1.
  3. Describes all possible values x with the associated probabilities .
  4. all of the above
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