数学题.docx
- 文档编号:11375084
- 上传时间:2023-02-28
- 格式:DOCX
- 页数:23
- 大小:146.89KB
数学题.docx
《数学题.docx》由会员分享,可在线阅读,更多相关《数学题.docx(23页珍藏版)》请在冰豆网上搜索。
数学题
1.y=2x2+7x–3
xy
2.
Thefigureaboveshowsthegraphofafunctionf,definedbyf(x)=|2x|+4
forallnumbersx.Forwhichofthefollowingfunctionsgdefinedforall
numbersxdoesthegraphofgintersectthegraphoff?
Ag(x)_x–2
Bg(x)_x_3
Cg(x)_2x–2
Dg(x)_2x_3
Eg(x)_3x–2
3.EachemployeeofacertaincompanyisineitherDepartmentXor
DepartmentY,andtherearemorethantwiceasmanyemployeesin
DepartmentXasinDepartmentY.Theaverage(arithmeticmean)salary
is$25,000fortheemployeesinDepartmentXandis$35,000forthe
employeesinDepartmentY.Whichofthefollowingamountscouldbe
theaveragesalaryforalloftheemployeesinthecompany?
Indicateallsuchamounts.
A$26,000
B$28,000
C$29,000
D$30,000
E$31,000
F$32,000
G$34,000
4.Workingaloneatitsconstantrate,machineAproduceskcarpartsin10
minutes.Workingaloneatitsconstantrate,machineBproduceskcarparts
in15minutes.HowmanyminutesdoesittakemachinesAandB,working
simultaneouslyattheirrespectiveconstantrates,toproducekcarparts?
____________minutes
5.
1)IfthedollaramountofsalesatStorePwas$800,000for2006,whatwas
thedollaramountofsalesatthatstorefor2008?
A$727,200
B$792,000
C$800,000
D$880,000
E$968,000
2)AtStoreT,thedollaramountofsalesfor2007waswhatpercentofthe
dollaramountofsalesfor2008?
Giveyouranswertothenearest0.1percent.
___________%
3)Whichofthefollowingstatementsmustbetrue?
Indicateallsuchstatements.
AFor2008thedollaramountofsalesatStoreRwasgreaterthanthatat
eachoftheotherfourstores.
BThedollaramountofsalesatStoreSfor2008was22percentless
thanthatfor2006.
CThedollaramountofsalesatStoreRfor2008wasmorethan17
percentgreaterthanthatfor2006.
6.Acertainstoresellstwotypesofpens:
onetypefor$2perpenandthe
othertypefor$3perpen.Ifacustomercanspendupto$25tobuypensat
thestoreandthereisnosalestax,whatisthegreatestnumberofpensthe
customercanbuy?
A9
B10
C11
D12
E20
7.Alistofnumbershasameanof8andastandarddeviationof2.5.Ifxisa
numberinthelistthatis2standarddeviationsabovethemean,whatisthe
valueofx?
x=______
8.FrequencyDistributionforListX
Number1235
Frequency10201812
FrequencyDistributionforListY
Number6789
Frequency2417109
ListXandlistYeachcontain60numbers.Frequencydistributionsforeachlistaregivenabove.Theaverage(arithmeticmean)ofthenumbersinlistXis2.7,andtheaverageofthenumbersinlistYis7.1.ListZcontains120numbers:
the60numbersinlistXandthe60numbersinlistY.
QuantityAQuantityB
Theaverageofthe120numbersinlistZThemedianofthe120numbersinlistZ
9.Thefigureaboveshowsthegraphofthefunctionfinthexy-plane.Whatis
thevalueoff(f(–1))?
A–2
B–1
C0
D1
E2
10.Byweight,liquidAmakesup8percentofsolutionRand18percentofsolutionS.If3gramsofsolutionRaremixedwith7gramsofsolutionS,thenliquidAaccountsforwhatpercentoftheweightoftheresultingsolution?
A10%
B13%
C15%
D19%
E26%
11.Ofthe700membersofacertainorganization,120arelawyers.Twomembersoftheorganizationwillbeselectedatrandom.Whichofthefollowingisclosesttotheprobabilitythatneitherofthemembersselectedwillbealawyer?
A0.5
B0.6
C0.7
D0.8
E0.9
12.Linekliesinthexy-plane.Thex-interceptoflinekis–4,andlinekpassesthroughthemidpointofthelinesegmentwhoseendpointsare(2,9)and(2,0).Whatistheslopeoflinek?
Giveyouranswerasafraction._______
13.
Inthecourseofanexperiment,95measurementswererecorded,andallofthemeasurementswereintegers.The95measurementswerethengroupedinto7measurementintervals.Thegraphaboveshowsthefrequencydistributionofthe95measurementsbymeasurementinterval.
QuantityAQuantityB
Theaverage(arithmeticThemedianofthe95
mean)ofthe95measurements
Measurements
14.TherandomvariableXisnormallydistributed.Thevalues650and850areatthe60thand90thpercentilesofthedistributionofX,respectively.
QuantityAQuantityB
Thevalueatthe75th750
percentileofthe
distributionofX
15.If1+x+x2+x3=60,thentheaverage(arithmeticmean)ofx,x2,x3,and
x4isequaltowhichofthefollowing?
A12x
B15x
C20x
D30x
E60x
16.
ParallelogramOPQRliesinthexy-plane,asshowninthefigureabove.The
coordinatesofpointPare(2,4)andthecoordinatesofpointQare(8,6).
WhatarethecoordinatesofpointR?
A(3,2)
B(3,3)
C(4,4)
D(5,2)
E(6,2)
17.LetSbethesetofallpositiveintegersnsuchthatn2isamultipleofboth
24and108.Whichofthefollowingintegersaredivisorsofeveryintegern
inS?
Indicateallsuchintegers.
A12
B24
C36
D72
18.Therangeoftheheightsofthefemalestudentsinacertainclassis13.2inches,andtherangeoftheheightsofthemalestudentsintheclassis15.4inches.
Whichofthefollowingstatementsindividuallyprovide(s)sufficientadditionalinformationtodeterminetherangeoftheheightsofallthestudentsintheclass?
Indicateallsuchstatements.
AThetallestmalestudentintheclassis5.8inchestallerthanthetallestfemalestudentintheclass.
BThemedianheightofthemalestudentsintheclassis1.1inchesgreaterthanthemedianheightofthefemalestudentsintheclass.
CTheaverage(arithmeticmean)heightofthemalestudentsintheclassis4.6inchesgreaterthantheaverageheightofthefemalestudentsintheclass.
19.ArandomvariableYisnormallydistributedwithameanof200andastandarddeviationof10.
QuantityAQuantityB
Theprobabilityoftheevent1/6
thatthevalueofYis
greaterthan220
20.Inagraduatingclassof236students,142tookalgebraand121tookchemistry.
Whatisthegreatestpossiblenumberofstudentsthatcouldhavetakenboth
algebraandchemistry?
__________students
21.ThetotalamountthatMarypaidforabookwasequaltothepriceofthebookplusasalestaxthatwas4percentofthepriceofthebook.Marypaidforthebookwitha$10billandreceivedthecorrectchange,whichwaslessthan$3.00.Whichofthefollowingstatementsmustbetrue?
Indicateallsuchstatements.
AThepriceofthebookwaslessthan$9.50.
BThepriceofthebookwasgreaterthan$6.90.
CThesalestaxwaslessthan$0.45.
22.Whichofthefollowingstatementsindividuallyprovide(s)sufficientadditionalinformationtodeterminetheareaoftriangleABCabove?
Indicateallsuchstatements.
ADBCisanequilateraltriangle.
BABDisanisoscelestriangle.
CThelengthofBCisequaltothelengthofAD.
DThelengthofBCis10.
EThelengthofADis10
23.Thefabricneededtomake3curtainssellsfor$8.00peryardandcanbe
purchasedonlybythefullyard.Ifthelengthoffabricrequiredforeach
curtainis1.6yardsandallofthefabricispurchasedasasinglelength,
whatisthetotalcostofthefabricthatneedstobepurchasedforthe3
curtains?
A$40.00
B$38.40
C$24.00
D$16.00
E$12.80
24.Thefabricneededtomake3curtainssellsfor$8.00peryardandcanbe
purchasedonlybythefullyard.Ifthelengthoffabricrequiredforeach
curtainis1.6yardsandallofthefabricispurchasedasasinglelength,
whatisthetotalcostofthefabricthatneedstobepurchasedforthe3
curtains?
A$40.00
B$38.40
C$24.00
D$16.00
E$12.80
25.Inthexy-plane,thepointwithcoordinates(–6,–7)isthecenterofcircleC.
Thepointwithcoordinates(–6,5)liesinsideC,andthepointwith
coordinates(8,–7)liesoutsideC.IfmistheradiusofCandmisan
integer,whatisthevalueofm?
m=_____
26.Whatistheleastpositiveintegerthatisnotafactorof25!
andisnota
primenumber?
A26
B28
C36
D56
E58
27If1isexpressedasaterminatingdecimal,howmanynonzerodigits
1/[(211)(517)]
willthedecimalhave?
AOne
BTwo
CFour
DSix
EEleven
28.Eighthundredinsectswereweighed,andtheresultingmeasurements,in
milligrams,aresummarizedintheboxplotbelow.
(a)Whataretherange,thethreequartiles,andtheinterquartilerangeofthe
measurements?
(b)Ifthe80thpercentileofthemeasurementsis130milligrams,abouthow
manymeasurementsarebetween126milligramsand130milligrams?
29.Thefigureshowsanormaldistributionwithmeanmandstandarddeviationd,includingapproximatepercentsofthedistributioncorrespondingtothesixregionsshown.
Supposetheheightsofapopulationof3,000adultpenguinsareapproximatelynormallydistributedwithameanof65centimetersandastandarddeviationof5centimeters.
(a)Approximatelyhowmanyoftheadultpenguinsarebetween65centimetersand75centimeterstall?
(b)Ifanadultpenguinischosenatrandomfromthepopulation,approximatelywhatistheprobabilitythatthepenguin’sheightwillbelessthan60centimeters?
Giveyouranswertothenearest0.05
机经题:
8月
5选1
1.3个数的平均数是30,把这3个数翻倍之后也加在这个list中。
问加进去后,6个数的平均数是多少。
2.一个矩形里有个圆,圆外的面积涂阴影,圆面积是阴影面积的一半,求矩形面积与圆面积的比例。
补充:
好像还有个答案是(0,-50)
3.哪个选项满足-f(x)=f(x)?
然后给了一些函数表达式。
爆简单吧~~
4.本金是a(给了具体数的,忘了),单利,年利率r%,一个月后利息是a/100,求r。
5.1-9这9个整数中选2个,选中的都是3的倍数的概率。
6.x<0,0 (特值法就好了) 7.某次测验,70分以上的有75%,85分以下的60%,求70到85分的人占总数的百分比(应该是35%) 8.Theaveragetestscoreof2boysis75andthatof3girlsis95.Whatisthetotalaveragescoreof5people? 5选多 1.一串数的range(极差)是21,求这串数中最小、最大值的可能组合。 (秒杀,right? ) 2.坐标系中的一个圆,半径为50,圆心在原点,选哪些点在圆上。 (30,40)OK,(14,48)OK,还有个选项也是可以的,忘了 还有好多是跟在图表后出的,不好描述。 。 。 3.,好像是一个学校里有3/8是女生,有1/50是生物系学生,问该校可能有几名学生。 (其实就是找能够8和50的公
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 数学题