Sample?Space?样本空间The set of all possible outcomes of a statistical experiment is called the sample space.Event 事件An event is a subset of a sample space. certain event（必然事件）：The sample space itself, is certainly an event, which is called a certain event, means that it always occurs in the experiment. impossible event（不可能事件）：The empty set, denoted by, is also an event, called an impossible event, means that it never occurs in the experiment. Probability of events （概率）If the num
