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“等可能条件下的概率”主要从概率的古典定义出发展开对概率初步知识的研究。古典概型具有如下两个特征:(1)试验的所有可能出现的结果只有有限个;(2)每一个试验结果出现的可能性相同。一般地,如果一个试验有n个等可能的结果,当其中的m个结果之一出现时,事件A发生,那么事件A发生的概率P(A)=m/n,其中n为所有等可能出现的结果数,m为事件A发生可能出现的结果数,m,n为正整数。例1(2015·常州中考数学题)甲,乙,丙三位学生进入了“校园朗诵比赛”冠军、亚军和季军的决赛,他们将通过抽签来决定比赛的出场顺序.
“Probability of Probability and Other Probability” This study mainly starts with the classical definition of probability and starts with the preliminary knowledge of probability. The classical profile has the following two characteristics: (1) there are only a limited number of possible all possible occurrences of the test; and (2) the probability of each test result is the same. In general, if one test has n equal possible outcomes, event A occurs when one of the m results occurs, then the probability of event A occurring P (A) = m / n, where n is the probability of all The number of results that occur, m is the number of results that may occur for Event A, m, n is a positive integer. Example 1: Students of Grade A, B and C entered the final of “Campus Recital Contest”, runner-up and runner-up. They will draw the ballot to determine the order of the match.