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片段一:认识中位数师:前不久,学校教师进行了1分钟跳绳比赛,这是六年级语文组7位老师的成绩:师:第一名跳了多少个?最后一名呢?他俩各自的成绩能代表语文组的整体水平吗?生:王老师一分钟跳了135下,代表了最高水平,不能代表整体水平。生:李老师一分钟跳了111下,代表了最低水平,也不能反映语文组的整体水平。追问:如果想了解本次比赛六年级语文组的整体水平,怎么办?生:算出平均数。师:通常我们可以用平均数来表示一组数据的整体水平,接下来看看数学教师在本次比赛中的表现。
Fragment one: to know the median division: Not long ago, the school teachers conducted a 1-minute rope skipping competition, which is the sixth grade language group of seven teachers grades: division: the first number of jump? The last one? Students’ respective grades can represent the overall level of the language group? Students: Wang jumped 135 points in a minute, representing the highest level and can not represent the overall level. Students: Mr. Li jumped 111 points in a minute, representing the lowest level and not reflecting the overall level of the language group. Question: If you want to know the overall level of the sixth-grade language group in this competition, what to do? Students: Calculate the average. Teacher: Usually we can use the average to represent the overall level of a set of data, then look at the performance of math teachers in this competition.