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25.2 用列举法求概率 PowerPoint PPT Presentation


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复习巩固. 25.2 用列举法求概率. 等可能性事件. 1 。所有的结果是有限多个 2 。各种结果发生的可能性相等。. 复习巩固. 从一副扑克牌中取出的两组牌,分别是黑桃 1 、 2 、 3 、 4 和方块 1 、 2 、 3 、 4 ,将它们背面朝上分别重新洗牌后,从两组牌中各摸出一张,那么摸出的两张牌的牌面数字之和等于 5 的概率是多少?. 提出问题. 但在我们的身边,有很多试验的所有可能性是不相等且结果不是有限多个,这些事件的概率怎样确定呢?. 在同样条件下,通过大量反复的试验,根据一个随机事件发生的频率所逐渐稳定到的常数,可以估计这个事件发生的概率。.

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25.2 用列举法求概率

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