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What is a random variable?

  • A.A variable that changes unpredictably during a computation
  • B.A quantity that has been measured with experimental error
  • C.A quantity whose value is uncertain
  • D.A variable whose value is chosen at random by the algorithm

Answer: C

A random variable ranges over a set of possible values with a probability attached to each, and the uncertainty lies in the agent's knowledge rather than in the world necessarily. Random choice, unpredictable change and measurement error are different notions. Recognising that the randomness describes a state of information, rather than a property of the thing described, is what makes the Bayesian reading coherent.

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