广西2020版高考数学一轮复习单元质检十算法初步、统计与统计案例文.docx

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1单元质检十 算法初步、统计与统计案例(时间:45 分钟 满分:100 分)一、选择题(本大题共 6 小题,每小题 7 分,共 42 分)1.(2018 北京,文 3)执行如图所示的程序框图,输出的 s 值为( )A. B. C. D.12 56 76 712答案 B解析 第一步: s=1- ,k=2,k83+83+87+90+a+99,则 a6.635,因此有 99%的把握认为箱产量与养殖方法有关 .(3)箱产量的频率分布直方图表明:新养殖法的箱产量平均值(或中位数)在 50kg 到 55kg 之间,旧养殖法的箱产量平均值(或中位数)在 45kg 到 50kg 之间,且新养殖法的箱产量分布集中程度较旧养殖法的箱产量分布集中程度高,因此,可以认为新养殖法的箱产量较高且稳定,从而新养殖法优于旧养殖法 .

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