概念课是每一位数学教师经常遇到的课型,如何使学生自然的感受、理解、归纳概念,经历概念的形成过程是每一位数学教师应该深入思考的问题。本文笔者反复利用生活中同一情境,以此为变式,贯穿中位数、众数概念形成的全过程,纵横比较平均数、中位数、众数三种特征量,使学生对统计的三种特征量有了更加深刻的认识。 Concept class is a type of mathematics teachers often encounter each class, how to make students feel naturally, to understand and summarize the concept of experience is the formation of the concept of every mathematical teacher should think in depth. In this article, I repeatedly use the same situation in life, as a variant, through the median, the formation of the concept of the number of the whole process, the average aspect ratio, the median, the number of three kinds of characteristic variables, so that students on the statistical three A more profound understanding of the amount of features.