北师大版小学四年级下册平均数教学文稿.ppt

子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,内容：,子页题目,子页,子页,子页,子页,主页,子页,子页题目,子页,子页,子页,主页,子页,T,H,A,N,K,Y,O,U,*,北师大版 四年级下册 第六单元 数据的表示和分析,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,3539876326,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,3539876326,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,8942367535,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,8942367535,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,7859238952,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,7859238952,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,7138281595,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,7138281595,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,3596146328,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看你每次可以记住几个数字。,3596146328,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,每3秒呈现10个数字，看一看每次可以记住几个数字。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,淘气3秒钟能记住几个数字？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,平均每次记住6个数字是怎么得出来的？,小组交流：把你的想法在小组内说一说，然后小组派一个代表说一说你们的结果。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,第1次,第2次,第3次,第4次,第5次,方法一：,平均每次记住,“,6,”,个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,（54759）56（个）,方法二：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,淘气哪一次也没有记住6个数字啊！为什么会这样？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你在生活中哪里见过平均数？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.在1分投篮比赛中，奇思前后4次投中的个数分,别为7个、7个、6个、8个。,（1）用什么,数可以表示奇思投中,的个数？,（2）如果第4次投中4个，那么4次的平均数是,多少？,（3）如果第4次投中12个，那么第4次的平均,数是多少？,7个,6个,8个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.下表是某地一星期的气温记录。请你分别算出,这星期最高气温和最低气温的平均值。,最高气温：（18+18+20+22+24+20+25）721,最低气温：（8+10+11+12+11+12+13）711,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,