求概率是中考的高频率题型.为方便同学们的学习,掌握简单概率的求法,现把求概率的常用方法归纳如下.一、用频率估算概率例1(2012年乌鲁木齐卷)在一个不透明的口袋里,装有仅颜色不同的黑球、白球若干只,某小组做摸球实验:将球搅匀后从中随机摸出一个,记下颜色,再放入袋中,不断重复,下表是活动中的 In order to facilitate the students to learn, to grasp the simple probability of the method, the general method of seeking probability is summarized as follows: First, the probability of frequency estimation Example 1 (2012 Urumqi Volume) in an opaque Of the pocket, with only different colors of black ball, white ball number only, a group to do touch ball experiment: the ball after mixing randomly from which one, note the color, and then into the bag, repeat, the following table Is active