Countability does have to do with it. Measure theory [0] allows us to extend the classical notions of discrete probability to continuous domains. [0] https://

Countability does have to do with it. Measure theory [0] allows us to extend the classical notions of discrete probability to continuous domains. [0] https://en.wikipedia.org/wiki/Measure_(mathematics) https://en.wikipedia.org/wiki/Measure_(mathematics) https://en.wikipedia.org/wiki/Probability_measure https://en.wikipedia.org/wiki/Probability_measure