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一、创设情境,引出平均数⑴谈话:同学们,学校准备举行一次教师投篮比赛,李老师、王老师都在积极练习呢。想看看他们练习的结果吗?你最想知道什么(谁投得准)?⑵我把两位老师的投中情况进行了统计。今天继续学习统计(板书:统计)。⑶每人每次投15个球。李老师练习了3次,王老师练习了4次。讨论:李老师有一次投中7个,王老师有一次投中8个,你能判断出谁投得比较准吗?为什么(引导:这信息不能代表两位老师投篮的水平)?出示:完整的投中情况统计(李:5,7,6;王:2,7,3,8)。问:现在你能判断出谁投得准了吗?你准备怎样判断,
First, create the situation, leads to the average ⑴ conversation: students, the school is ready to hold a teacher shooting competition, Li, Wang are active in it. Want to see the results of their practice it? What do you want to know (who voted for)? ⑵ I put the statistics of the two teachers in the vote. Today continue to learn statistics (blackboard: statistics). ⑶ each vote 15 balls. Teacher Li practiced 3 times, Teacher Wang practiced 4 times. Discussion: Li once cast 7, Wang once cast 8, you can determine who voted more accurate? Why (guide: this information does not represent the level of the two teachers shot)? Show: complete Of the vote statistics (Li: 5,7,6; Wang: 2,7,3,8). Q: Now you can determine who voted for it? How are you going to judge,