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对于初学概率的同学而言,计算随机事件发生的概率往往是很棘手的问题,这主要是计算要领没有掌握所致。为帮助同学们正确计算某些随机事件发生的概率,现将其求解策略介绍如下:一、利用总概率为1计算例1(2013年贵州省贵阳市中考题)某校学生小亮每天骑自行车上学时都要经过一个十字路口,设十字路口有红、黄、绿三色交通信号灯,他在路口遇到红灯的概率为1/3,遇到绿灯的概率为5/9,那么他遇到黄灯的概
For beginners probability students, calculating the probability of random events is often a very difficult issue, which is mainly due to the lack of mastery of computing essentials. To help students correctly calculate the probability of certain random occurrences, the solution strategies are as follows: First, the use of a total probability of 1 Calculation Example 1 (Guiyang City, Guizhou Province 2013 senior high school entrance examination questions) a school student Xiaoliang a day riding a bicycle Go to school must go through a crossroads, located at the crossroads of red, yellow, green three-color traffic lights, he encountered a red light at the junction of the probability of 1/3, the probability of encountering the green light 5/9, then he met To the general outline of the yellow light