解事件与概率问题常犯的错误例析

• 作 者: 杨文金
• 出 处: 数学爱好者(高一新课标人教版)
• 发表日期: 2008年04期
• 关键词: 概率问题 中易 题设条件 阴影区域 错解 三角形区域 几何度量 次品率 几何概型 批产品

事件与概率问题思维抽象,概念较多,解题时稍有疏忽就会致错,本文就解题中易产生失误的原因作些总结,希望对同学们的学习能有所帮助.一、混淆了“概率”与“频率”例1有下列两个命题:(1)抛掷100次硬币,出现正面朝上的频率为0.4,则硬币正面向上的次数为40次;

Event and probability problems are abstract in thought, there are many concepts, and slight negligence in solving problems will cause mistakes. This article summarizes the causes of mistakes in solving problems and hopes to help the students in learning. I. Confusion The “Probability” and “Frequency.” Example 1 has the following two propositions: (1) Throw 100 coins, with a face up frequency of 0.4, then the coin up face up to 40 times;