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MMLU / Which of the following is true about any discrete probability distribution of a…

Problem

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question

Which of the following is true about any discrete probability distribution of a random variable X?

choices

  1. The expected value of X = np.
  2. The sum of all possible values of X is equal to one.
  3. The probabilities of all possible values of X must add up to one.
  4. The probability distribution is bell-shaped and symmetric.

subject

high_school_statistics

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Official source

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