新GRE数学真题(OG机经)[精华]

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1、21.y=2x+7x–3xy2.Thefigureaboveshowsthegraphofafunctionf,definedbyf(x)=

2、2x

3、+4forallnumbersx.Forwhichofthefollowingfunctionsgdefinedforallnumbersxdoesthegraphofgintersectthegraphoff?Ag(x)x–2Bg(x)x3Cg(x)2x–2Dg(x)2x3Eg(x)3x–23.EachemployeeofacertaincompanyisineitherDepartmentXorDepartmentY,andthe

4、rearemorethantwiceasmanyemployeesinDepartmentXasinDepartmentY.Theaverage(arithmeticmean)salaryis$25,000fortheemployeesinDepartmentXandis$35,000fortheemployeesinDepartmentY.Whichofthefollowingamountscouldbetheaveragesalaryforalloftheemployeesinthecompany?Indicateallsuchamounts.A$26,000B$28,000C$29,00

5、0D$30,000E$31,000F$32,000G$34,0004.Workingaloneatitsconstantrate,machineAproduceskcarpartsin10minutes.Workingaloneatitsconstantrate,machineBproduceskcarpartsin15minutes.HowmanyminutesdoesittakemachinesAandB,workingsimultaneouslyattheirrespectiveconstantrates,toproducekcarparts?____________minutes5.1

6、)IfthedollaramountofsalesatStorePwas$800,000for2006,whatwasthedollaramountofsalesatthatstorefor2008?A$727,200B$792,000C$800,000D$880,000E$968,0002)AtStoreT,thedollaramountofsalesfor2007waswhatpercentofthedollaramountofsalesfor2008?Giveyouranswertothenearest0.1percent.___________%3)Whichofthefollowin

7、gstatementsmustbetrue?Indicateallsuchstatements.AFor2008thedollaramountofsalesatStoreRwasgreaterthanthatateachoftheotherfourstores.BThedollaramountofsalesatStoreSfor2008was22percentlessthanthatfor2006.CThedollaramountofsalesatStoreRfor2008wasmorethan17percentgreaterthanthatfor2006.6.Acertainstoresel

8、lstwotypesofpens:onetypefor$2perpenandtheothertypefor$3perpen.Ifacustomercanspendupto$25tobuypensatthestoreandthereisnosalestax,whatisthegreatestnumberofpensthecustomercanbuy?A9B10C11D12E207.Alistofnumbershasameanof8andastandarddeviationof2.5.Ifxisanumberinthelistthatis2standarddeviationsabovethemea

9、n,whatisthevalueofx?x=______8.FrequencyDistributionforListXNumber1235Frequency10201812FrequencyDistributionforListYNumber6789Frequency2417109ListXandlistYeachcontain60numbers.Frequencydistributionsfor