首页
登录
职称英语
TRAVELERS SURVEYED: 250[img]2015m7x/ct_egreqj_egreqtbz1_0188_20151[/img]In a s
TRAVELERS SURVEYED: 250[img]2015m7x/ct_egreqj_egreqtbz1_0188_20151[/img]In a s
游客
2024-01-12
49
管理
问题
TRAVELERS SURVEYED: 250
In a survey of 250 European travelers, 93 have traveled to Africa, 155 have traveled to Asia, and of these two groups, 70 have traveled to both continents, as illustrated in the Venn diagram above.
(a)How many of the travelers surveyed have traveled to Africa but not to Asia?
(b)How many of the travelers surveyed have traveled to at least one of the two continents of Africa and Asia?
(c)How many of the travelers surveyed have traveled neither to Africa nor to Asia?
选项
答案
23
178
72
解析
In the Venn diagram, the rectangular region represents the set of all travelers surveyed; the two circular regions represent the two sets of travelers to Africa and Asia, respectively; and the shaded region represents the subset of those who have traveled to both continents.
(a)The set described here is represented by the part of the left circle that is not shaded. This description suggests that the answer can be found by taking the shaded part away from the first circle—in effect, subtracting the 70 from the 93, to get 23 travelers who have traveled to Africa but not to Asia.
(b)The set described here is represented by that part of the rectangle that is in at least one of the two circles. This description suggests adding the two numbers 93 and 155. But the 70 travelers who have traveled to both continents would be counted twice in the sum 93 + 155. To correct the double counting, subtract 70 from the sum so that these 70 travelers are counted only once:
93 + 155-70=178
(c)The set described here is represented by the part of the rectangle that is not in either circle. Let N be the number of these travelers. Note that the entire rectangular region has two main nonoverlapping parts: the part outside the circles and the part inside the circles. The first part represents N travelers and the second part represents 93 + 155 - 70 = 178 travelers(from question(b)). Therefore,
250 = N+178
and solving for N yields
N= 250 -178 = 72
转载请注明原文地址:https://tihaiku.com/zcyy/3355415.html
相关试题推荐
Formanytravelers,chartervacationsoftenturnouttocostconsiderablymoret
Amajorityoftheinternationaljournalistssurveyedviewnuclearpowerstations
Acompany’spersonneldirectorsurveyedemployeesabouttheirsatisfactionwith
Forthefunction[img]2011q4/ct_egreqj_egreqjs_0108_201131[/img]whatistheval
[img]2011q4/ct_egreqj_egreqjs_0049_20113[/img]Thisproblemrequiresyoutofind
[img]2011q4/ct_egreqj_egreqjs_0046_20113[/img]Findthesquarerootsbeforeyou
[img]2011q4/ct_egreqj_egreqjs_0044_20113[/img]Firstconvert1/5toitsdecimal
[img]2012q1/ct_egreqm_egreqtbz1_0017_20121[/img][br]In1970,ifthecosttopr
[img]2012q1/ct_egreqm_egreqtbz1_0017_20121[/img][br]In1990,thetotalrevenue
[img]2012q1/ct_egreqm_egreqjs_0129_20121[/img]A、 B、 C、 D、 
随机试题
Sinceitistoolatetochangemymind,Iam______tocarryingouttheplan.A、c
Whatisthemaintopicofthisconversation?[br][originaltext]M:Weseemtob
Thedifferencebetweenaliquidandagasisobvious【C1】______thecondition
线路光纤差动保护,以两侧电流的矢量和作为差动保护的差动电流。()
D左下上标+右下=中间,13+1=2,32+2=11,24+4=68,42+3=19。
风险的存在通常会对经济单位的财务状况产生影响,以下对这种影响描述不正确的是()。
对建造普通标准住宅出售的,增值额未超过扣除项目金额()的,免征土地增值税.A:2
一天妍妍跑到老师跟前说:“老师,我的动物橡皮不见了,我看到小睛拿走了。”老师听了
简述现代企业人力资源管理各个历史发展阶段的特点。
构成传染过程必须具备的因素是A.病原体、易感机体 B.传染源、传播途径、易感人
最新回复
(
0
)