Wherever there is some random (that is, non-determinate) element in the occurrence of an event.
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Experimental or empirical probability.
Probability determined as part of an experiment is called experimental probability. Probability determined by analysis of all of the possible and expected outcomes is called theoretical probability.
Correct.
Theoretical probability.
That's the probability that both events will happen, possibly even at the same time. I think it's called the 'joint' probability.