2019年春七年级数学下册第十章数据的收集、整理与描述10.3课题学习从数据谈节水课件(新版)新人教版.pptx

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第十章 数据的收集、整理与描述,人均月用水量为3吨的人数为50人;其中用淘米水浇花的占15%;如果全校学生家庭的总人数为3000人,根据这150名同学家庭月人均用水量,估算全校学生家庭的月用水总量为9040吨,其中正确的是( D ) A. B. C. D.,4.小明调查了他们班50名同学各自家庭的人均日用水量( 单位:升 ),结果如下: 55 42 50 48 42 35 38 39 40 51 47 52 50 42 43 47 52 48 54 52 38 42 60 52 41 46 35 47 53 48 52 47 50 49 57 43 40 44 52 50 49 37 46 42 62 58 46 48 39 60 请根据以上数据绘制频数分布表和频数分布直方图,并回答下列问题: ( 1 )家庭人均日用水量在哪个范围的家庭最多?这个范围的家庭占全班家庭的百分之几? ( 2 )家庭人均日用水量最少和最多的家庭各占全班家庭的百分之几? ( 3 )如果每人每天节约用水8升,按全班50人计算,一年( 按365天计算 )可节约用水多少吨?按生活基本日均需水量50升的标准计算,这些水可供1个人多长时间的生活用水?,

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