5.必修3《统计》习题(有答案)

在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmentthroughon-siteandoff-siteinspection,investigationreport,interviewswithinvestigatorsforpre-loaninvestigationworkbywayofconductingsupervisionandinspection,qualityevaluationpre-loaninvestigationwork,andbasedontheevaluationresults,theimplementationofdiversitymanagement.24ththecontrolandinspection(a)theimplementationofthecreditsystem:thereisnobreachofcreditpolicyrelatingtothegrantingofcreditandtheheadoffice;(B)dualcreditrating:timelinessofratings,whethertheprovisionsoftherating,ratingresultsareaccurate;(C)thesurveycontents:datacollectioniscomplete,reportwritingiscomprehensive,indicatorsanalysisisobjective,real,conclusionsandthefactsareconsistentandreasonable;(D)doubleimplementationofinvestigationssystem:practicalimplementationofdoublesystem;(E)othersupervisionandinspectionofthecontents.25thduediligenceevaluationofficesandbranches(jurisdiction),riskmanagement,MarketingManagementDepartmentagreedtocarryoutpre-loaninvestigationsupervisionandinspectionwork,evaluatewhetherinvestigatorsduediligencetodeterminewhethertheexemptionshouldbe.Investigatorsshouldbecompatiblewith.Duediligenceassessmentshouldbebasedonthefactthat,followingtheprinciplesofobjectivity,impartialityandfairness.Article26thhead必修3《统计》单元练习题1、要完成下列两项调查，①从某社区125户高收入家庭、280户中等收入家庭、95户低收入家庭中选出100户调查社会购买力的某项指标；②从某中学的15名艺术特长生中选出3人调查学习负担情况，宜采用的抽样方法依次为（）A．①用随机抽样法，②用系统抽样法B．①用分层抽样法，②用简单随机抽样法C．①用系统抽样法，②用分层抽样法D．①②都用分层抽样法2、100个个体分成10组，编号后分别为第1组：00，01，02，…，09；第2组：10，11，12，…，19；…；第10组：90，91，92，…，99．现在从第k组中抽取其号码的个位数与1km的个位数相同的个体，其中m是第1组随机抽取的号码的个位数，则当5m时，从第7组中抽取的号码是（）A．71B．61C．75D．653、某校对高三年级的学生进行体检，现将高三男生的体重kg数据进行整理后分成5组，并绘制频率分布直方图（如图1所示）．根据一般标准，高三男生体重超过65kg属于偏胖，低于55kg属于偏瘦．已知图中从左到右第一，第三，第四，第五小组的频率分别为0.25、0.20、0.10、0.05，第二小组的频数为400，则该校高三年级的男生总数和体重正常的概率分别为（）A．1000,0.60B．1000,0.50C．800,0.60D．800,0.504、对于一组数据ix（i=1，2，3，…，n），如果将它们改变为cxi（i=1，2，3，…，n），其中0c，则下列结论中正确的是（）A．平均数与方差均不变B．平均数不变，而方差变了C．平均数变了，而方差保持不变D．平均数与方差均发生了变化5、下列说法中，正确的是（）A．数据5,4,4,3,5,2的众数是4B．一组数据的标准差是这组数据的方差的平方C．数据2,3,4,5的标准差是数据4,6,8,10的标准差的一半D．频率分布直方图中各小长方形的面积等于相应各组的频数6、某工厂对一批产品进行了抽样检测.右图是根据抽样检测后的.u.c.o.产品净重（单位：克）数据绘制的频率分布直方图，其中产品净重的范围是[96，106]，样本数据分组为[96，98），[98，100),[100，102)，[102，104),[104，106],已知样本中产品净重7565605550体重/kg频率组距图1在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmentthroughon-siteandoff-siteinspection,investigationreport,interviewswithinvestigatorsforpre-loaninvestigationworkbywayofconductingsupervisionandinspection,qualityevaluationpre-loaninvestigationwork,andbasedontheevaluationresults,theimplementationofdiversitymanagement.24ththecontrolandinspection(a)theimplementationofthecreditsystem:thereisnobreachofcreditpolicyrelatingtothegrantingofcreditandtheheadoffice;(B)dualcreditrating:timelinessofratings,whethertheprovisionsoftherating,ratingresultsareaccurate;(C)thesurveycontents:datacollectioniscomplete,reportwritingiscomprehensive,indicatorsanalysisisobjective,real,conclusionsandthefactsareconsistentandreasonable;(D)doubleimplementationofinvestigationssystem:practicalimplementationofdoublesystem;(E)othersupervisionandinspectionofthecontents.25thduediligenceevaluationofficesandbranches(jurisdiction),riskmanagement,MarketingManagementDepartmentagreedtocarryoutpre-loaninvestigationsupervisionandinspectionwork,evaluatewhetherinvestigatorsduediligencetodeterminewhethertheexemptionshouldbe.Investigatorsshouldbecompatiblewith.Duediligenceassessmentshouldbebasedonthefactthat,followingtheprinciplesofobjectivity,impartialityandfairness.Article26thhead2小于100克的个数是36，则样本中净重大于或等于98克并且小于104克的产品的个数是().A.90B.75C.60D.457、一个公司共有240名员工，下设一些部门，要采用分层抽样方法从全体员工中抽取一个容量为20的样本．已知某部门有60名员工，那么从这一部门抽取的员工人数是________．8、如图是某学校举行的运动会上，七位评委为某体操项目打出的分数的茎叶统计图，去掉一个最高分和一个最低分后，所剩数据的平均数和方差分别为__________.9、为了检测某种产品的质量，抽取了一个容量为100的样本，数据的分组如下：分组频数频率10.75,10.85310.85,10.95910.95,11.051311.05,11.151611.15,11.252611.25,11.352011.35,11.45711.45,11.55a11.55,11.65m0.02（1）求出表中的,am的值；（2）画出频率分布直方图和频率折线图；（3）根据频率分布直方图估计这组数据的众数、中位数和平均数。（4）据上述图表，估计数据落在10.95,11.35范围内的可能性是百分之几？（5）数据小于11.20的可能性是百分之几？798446479396981001021041060.1500.1250.1000.0750.050克频率/组距在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmen