首页
登录
职称英语
How many of the inventoried textbooks were purchased by the two schools combined
How many of the inventoried textbooks were purchased by the two schools combined
游客
2025-02-24
9
管理
问题
How many of the inventoried textbooks were purchased by the two schools combined during the years 1974, 1975, and 1976? [br] Which of the following statements can be inferred from the graph?
I School X has a smaller enrollment than School Y.
II If the age of a book is the number of years since purchase, then the average (arithmetic mean) age of a book in the School Y inventory is less than that of a book in the School X inventory.
III According to the inventory, School X and School Y purchased the same number of textbooks in 1976.
选项
A、None
B、I only
C、II only
D、I and II
E、II and III
答案
C
解析
下面哪一句话可以从题目的图表中推断出来? I 学校X的在册学生比学校Y的在册学生少; II若书的年龄为图书购买后的年数,那么学校Y库存图书的平均年龄比学校X库存图书的平均年龄小; III根据库存,学校X和学校Y在1976年购买的教科书的数目相同。
解:本题的正确答案是(C)。由图表中图书的库存信息无法得到学校X与学校Y的学生的多少,所以I肯定不对;II中涉及库存图书的平均年龄,学校X库存图书的平均年龄为:8×15%+7×10%+6×19%+5×23%+4×13%+3×12%+2×8%=5.23,学校Y库存图书的平均书龄为:8×0.12%+7×0.08%+6×0.13%+5×0.2%+4×0.18%+3×0.21%+2×0.08%=3.91,所以II一定正确,其实由图表也可观察到学校X的年龄比较大的图书所占的比例均大于学校Y的也可判断II是正确的;由两学校的库存总量不同,可推知III肯定不对。
转载请注明原文地址:https://tihaiku.com/zcyy/3971380.html
相关试题推荐
Howmanyoftheinventoriedtextbookswerepurchasedbythetwoschoolscombined
Ifacertaincompanypurchaseditscomputerterminalsforatotalof$540,400an
Tomhad6books.Hegave2tohissisterandthenpurchased3morebooksatthe
Itisasadbutjustindictmentofsomehighschoolhistorytextbooksthatthey
Whentwochemicalcompoundsarecombined,a______effectcanbeachieved:theres
Dreamsare____inandofthemselves,but,whencombinedwithotherdata,theyc
Thecurrentdemandforqualityintheschoolsseemstoasknotforthedevelopme
ShorelandCountyrecentlypurchasedanareaofwildernesslandinthecounty
Whatskillscanyoulearninschool? SchoolsinChinafocusonteachingstudent
Writeaboutthefollowingtopic:Manyschoolshavesevereproblemswithstude
随机试题
TheDepartmentofHomelandSecurityhasfilledthenation’stopcyber-security
现代高等学校新的社会职能是()。A.培养专门人才 B.发展科学研究 C.直
天沟排水有关溢流口的叙述错误的是( )。A.可不设溢流口 B.应在女儿墙上设
下列不是外科感染特点的是A.多为混合感染 B.有明显的局部症状 C.常需手术
SSPE的病原体是A.麻疹病毒B.腮腺炎病毒C.HIVD.EBVE.ECHO病毒
在房地产居间业务中,安排交易双方签订合同时,如果立约的一方预先签订了合同,而在有
变电站直流电源系统直流网络供电方式中,()应采用集中辐射形供电方式。(A
甲骗取他人财物后,刚准备离开现场,骗局就被识破。被害人追赶甲。走投无路的甲从身上
发现学习是属于( )的教学策略。 A.以学生为中心 B.以教师为主导 C
最新回复
(
0
)