有限样本空间 There are only finite outcomes. Each outcomes individually consists an elementary event. For one coin toss,there are two outcomes-head and tail."Head"is an elementary event. The probability of an elementary event corresponds a specific outcome. If all outcomes are equally likely,then the probability of an event E can be computed as: p(E)=E total number of outcomes in E [A total number of outcomes有限样本空间 ◼ There are only finite outcomes. ◼ Each outcomes individually consists an elementary event. ❑ For one coin toss, there are two outcomes – head and tail. “Head” is an elementary event. ◼ The probability of an elementary event corresponds a specific outcome. ◼ If all outcomes are equally likely, then the probability of an event E can be computed as: total number of outcomes total number of outcomes in | | | | ( ) E A E p E = =