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下表是随机抽取的某公司部分员工的月收入资料. (1)请计算以上样本的平均数和中位数; (2)甲乙两人分别用样本平均数和中位数来估计推断公司全体员工月收入水平,请你写出甲乙两人的推断结论 ; ...
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某小区30名职工月收入抽样调查资料如下单位元 根据上述资料请回答 该小区随机抽取的
1586.2
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某公司从所有在职员工中随机抽取200人通过对这200人的调查估计 所有员工的平均薪酬满意度该抽样调查
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下表是随机抽取的某公司部分员工的月收入资料. 1请计算以上样本的平均数和中位数 2甲乙两人分
从某地区20000户居民家庭中随机抽取了426户进行调查得到职工家庭收入资料如下表
500~600
600~700
800~900
400~500
四某公司2009年10月辞退甲乙丙三名正式员工甲员工已经工作3年月收入5000元辞退时公司给予一次性
某公司有职工8000人从中随机抽取406人调查其每月工资收入状况的调查数据存放在Ex5_1数据库中月
256
257
258
259
某公司有职工8000人从中随机抽取406人调查其每月工资收入状况的调查数据存放在Ex5_1数据库中试
56.89%-70.20%
57.89%-69.20%
58.89%-68.20%
59.89%-67.20%
从某地区20000户居民家庭中随机抽取了426户进行调查得到职工家庭收入资料如下表
A
B
C
D
某公司共25名员工下表是他们月收入的资料. 1该公司员工月收入的中位数是元众数是元 2根据上
某小区30名职工月收入抽样调查资料如下单位元根据上述资料请回答该小区随机抽取的30名职工月平均收入为
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1%
99%
2.5%
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800
1200
1500
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1
2
5
10
某公司根据随机抽取的100名员工年龄的调查数据计算得出了公司全部员工的平均年龄这种分析数据的方法属于
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从某地区20000户居民家庭中随机抽取了426户进行调查得到职工家庭收入资料如下表
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小明同学欲研究通过导体的电流跟导体电阻的关系图甲是他设计的实验电路.1在实验过程中他保持电源电压不变通过改变AB间R的电阻值测得相应的电流值如表1所示.小明分析表1中数据发现总结不出电流跟电阻的定量关系其原因是.表12小明认真反思自己的实验过程后找出了自己的错误所在并采取了正确的实验操作.你认为小明每次改变电阻后接下来的正确操作是.3正确操作实验后小明将得到的实验数据记录在表2中分析表2中的数据你能得出的结论是.表24同组的小丽同学将小明设计的电路进行了改进在AB间接入电阻箱来代替定值电阻.如图乙所示你认为这样做的好处是.
如图所示一束光从空气斜射向水面入射光线及法线已画出.请画出这条入射光线的反射光线和折射光线的大概位置.
8分Theregularworldpresentedtousbyourfivesenses﹣youcouldcallitreality1.0﹣isnotalwaysthemostuser﹣friendlyofplaces.Wegetlostinunfamiliarcities;wemeetpeoplewhoselanguagewedon'tunderstand.Sowhynottrytheimprovedversion:augmentedrealityARorreality2.0ARtechnologyaddscomputer﹣producedimages图象ontherealworldviaamobilephonecameraorspecialvideoglasses. EarlyformsofARarealreadyhere.WiththerightdownloadssmartphonescandeliverinformationaboutnearbyATMsandrestaurantsandotherpointsofinterest.Butthat'sjustthebeginning.Afewyearsfromnowthequantityofinformationavailablewillhaveincreasedhugely.Youwillnotonlyseethatthere'saChineserestaurantonthenextblockbutyouwillbeabletoseethemenuandreadreviewsofit. Thisiswherethenextrevolutionincomputingwilltakeplace:intheinterface界面betweentherealworldandtheinformationbroughttousviatheInternet.Imaginebubblesfloatingbeforeyoureyesfilledwithcoolinformationaboutanythingandeverythingthatyouseeinfrontofyou. Let'sjumpaheadtotenyearsfromnow.Apersontryingtofixtheircarwon'tbereadingabookwithpictures;theywillbewearingadevicethatprojectsanimated3﹣Dcomputergraphicsontotheequipmentunderrepairlabellingpartsandgivingstep﹣by﹣stepguidance. ThewindowontotheARworldcanbeasmartphoneorspecialvideoglasses.Butintenyears'timethesewillhavebeenreplacedbycontactlenses隐形眼镜withtinyLEDswhichpresentsomethingatareadabledistanceinfrontoftheeye.Soadeafpersonwearingtheselenseswillbeabletoseewhatpeoplearesaying. Thequestioniswhileweareallabsorbedinournewaugmentedrealityworldshowwillwebecommunicatingwitheachother 1Whatdoesthetextmainlytalkabout A.Thenextinformationtechnologyrevolution. B.Earlyformsofaugmentedrealitytechnology. C.Thedifferencesbetweenreality1.0andreality2.0. D.Therelationshipbetweenpeoplelivinginreality2.0. 2WhatdoestheunderlinedworditrefertoinParagraph2 A.Themenu. B.Theblock. C.Therevolution. D.Therestaurant. 3WhataretinyLEDsusedtodo A.Protectpeople'seyes. B.Showtextandimages. C.Warnusersofdangers. D.Replacevideoglasses. 4What'stheauthor'sattitudetowardsARtechnology A.Doubtful. B.Disapproving. C.Favourable. D.Ambiguous.
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