2019年春八年级数学下册第20章数据的初步分析本章中考演练课件(新版)沪科版.pptx

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第20章 数据的初步分析,2.( 湘西中考 )在某次体育测试中,九年级( 1 )班5位同学的立定跳远成绩( 单位:m )分别为:1.81,1.98,2.10,2.30,2.10.这组数据的众数为( B ) A.2.30 B.2.10 C.1.98 D.1.81 3.( 永州中考 )已知一组数据45,51,54,52,45,44,则这组数据的众数、中位数分别为( A ) A.45,48 B.44,45 C.45,51 D.52,53,13.( 广州中考 )随着移动互联网的快速发展,基于互联网的共享单车应运而生,为了了解某小区居民使用共享单车的情况,某研究小组随机采访该小区的10位居民,得到这10位居民一周内使用共享单车的次数分别为:17,12,15,20,17,0,7,26,17,9. ( 1 )这组数据的中位数是 16 ,众数是 17 . ( 2 )计算这10位居民一周内使用共享单车的平均次数. ( 3 )若该小区有200名居民,试估计该小区居民一周内使用共享单车的总次数.,

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