绘制频数直方图.pptx

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,2019-5-17,#,频数分布直方图,2019.5,情境导入,为了参加校运会进场式，七年级,7,班准备从,39,名同学中挑出身高相差不多的,16,名同学摆出造型,。,第一步，,收集,全班,39,名同学的身高,（,单位：,cm,）,171,155,167,160,165,161,159.5,152,160,160,177,155,170,150,160,148,158.5,160,165,162,157,155,160.5,150,160.5,151,159,169,165,149,150,176,163,150,170,157,180,160,165,7,班身高数据收集,7,班身高条形统计图,对数据进行适当的分组,171,155,167,160,165,161,159.5,152,160,160,177,155,170,150,160,148,158.5,160,165,162,157,155,160.5,150,160.5,151,159,169,165,149,150,176,163,150,170,157,180,160,165,7,班身高频数分布表,设身高为,xcm,频数,频率,145,x,150,2,0.051,150 x155,6,0.154,155x160,8,0.205,160 x165,11,0.282,165x170,6,0.154,170 x175,3,0.077,175x180,2,0.051,180,x,185,1,0.026,39,1,7,班身高频数分布条形图,0 145 150,155,160,165 170,175,180,185,7,班身高频数分布直方图,绘制频数分布直方图步骤,1.,找出最大值最小值，计算变化范围（极差）,2.,决定组距和组数,3.,列频数分布表,4.,画频数分布直方图、,5.,描述、分析数据,频数分布直方图和条形统计图的异同,同,1.,利用平面直角坐标系,2.,确切、直观显示数据,异,1.,直方图具有连续性,2.,直方图反应各区间频数的分布情况,