Question: 1.8. If Q is discrete (countable), then every r.v. is discrete. Conversely, every r.v. in a probability space is discrete if and only if the

1.8. If Q is discrete (countable), then every r.v. is discrete. Conversely, every r.v. in a probability space is discrete if and only if the p.m. is atomic.

[HINT: Use Exercise 23 of Sec. 2.2.]

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