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What is a discrete random variable?

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Which is the best and why?

A discrete random variable is:
A. outcomes over a continuous range of real numbers
B. a numerical description of the outcome of an experiment
C. one for which the number of possible outcomes can be counted
D. one for which the number of possible outcomes can not be counted

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The expert determines what a discrete random variable is.

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C. one for which the number of possible outcomes can be counted

C is ...

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