ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.3.2 中位数与众数(1)课题3.2 中位数与众数(1) 目标1.理解中位 数,众数等概念,能根据所给的信息求出一组数据的中位数,众数2.能结合具体的情境理解平均数,中位数和众数的联系与区别,并能根据具体问题,选择合适的统计量表示数据的集中程度。重点掌握中位数和众数的意义,会找出一组数据的中位数和众数。难点能在具体问题中理解中位数和众数的意义,根据具体情境合理选择教法讨论,探究教学过程备注一、【学前预习反馈】阅读课本 P104-1051、中位数:将一组数据按_________顺序排列,假如数据的个数是奇数,那么处于_________叫做这组数据的中位数;假如数据的个数是偶数,那么处于_________________________叫做这组数据的中位数.2、众数:一组数据中__________________的数据叫做这组数据的众数3.1.(1)数据组 5,4,8,6,9,4 的平均数是_________.中位数_________.众数_________.(2)数据组 121,120,122,123,119,125,126,117,125 的平均数_________.二、【新知探求】1. 中位数、众数的概念注:假如一组数据中所有数据__________________,那么平均数就能较好地反映这组数据的集中趋势;假如一组数据中______________________时,通常用中位数来描述这组数据的集中趋势;假如一组数据中有__________________时,常用众数来描述这组数据的集中趋势。2、典型例题例 1、在一次男子马拉松长跑竞赛中,抽得 12 名选手的成绩(单位:分)如Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the lea...