事件 定义
事件是概率空间的某个子集。因此，事件是 结果 的集合，其中已分配了 概率。通常，事件是样本空间的任何子集（可能包括空集）。
A sure event would mean it has a 100% probability of occurring whereas in contrast, an impossible event has zero probability of occurring. For example, a possible event when a single six-sided die is rolled is {2, 3}. That is, rolling the die could yield a 2 or a 3.
来源
“Event.” From Wolfram MathWorld, mathworld.wolfram.com/Event.html.
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