首页
登录
职称英语
In a group of 80 students, 24 are taking physics, 40 are taking mathematics, and
In a group of 80 students, 24 are taking physics, 40 are taking mathematics, and
游客
2024-01-12
77
管理
问题
In a group of 80 students, 24 are taking physics, 40 are taking mathematics, and 20 are taking both physics and mathematics. If a student were’ randomly selected from all of the 80 students, what is the probability that the student selected are taking neither physics nor mathematics?
选项
A、0.20
B、0.25
C、0.45
D、0.55
E、0.60
答案
C
解析
设集合A是注册物理的同学,集合B是注册数学的同学,那么A=24,B=40,AB=20,T=8,T=A+B-AB+N,代入后得到:80=24+40-20+N,N=36,即两门课都没有注册的人数为36,那么所求概率为36/80=0.45。
转载请注明原文地址:https://tihaiku.com/zcyy/3354772.html
相关试题推荐
Schoolsexpecttextbookstobeavaluablesourceofinformationforstudents
Schoolsexpecttextbookstobeavaluablesourceofinformationforstudents
Schoolsexpecttextbookstobeavaluablesourceofinformationforstudents
Collegeprofessor:Collegestudentsdonotwritenearlyaswellastheyusedto.
Thedirectorofasecondaryschoolwheremanystudentswerehavingsevereacadem
Inaphysicaleducationclass,20studentsweretestedonarcherytargetshootin
Studentscanlearnmathematicsonlybyexploringitontheirown,withgenerous
Inthelasttenyears,thedropoutrateamongBlackhighschoolstudentsfellsu
Physicsprofessors,theArnmoreLaboratoriesandArnmoreResearchFacilitieswer
Studentsinthemetropolitanschooldistrictlackmathskillstosuchalargede
随机试题
BigBenis______[br]Theclockstrikes(敲;打)every______ofanhour.A、tenmin
Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehavior
Everyprofessionortrade,everyart,andeverysciencehasitsowntechnica
[originaltext]Sinceaunionrepresentativevisitedourcompanytoinformus
资本寻求其生存和发展的各种必要条件的集中表现为项目对( )。A.利润的追逐
Thechangeinthatvillagewasmiraculou
某中年男患者因心脏病发作被送到急诊室,症状及检查结果均明确提示心肌梗死。患者很清
2020年,全国软件和信息技术服务业(即软件业)企业超4万家,累计完成软件业务收
关于维生素缺乏症的叙述,不正确的是 A.VitA缺乏——夜盲症B.Vit
双馈式机组属于( )。A.火力发电设备 B.核电设备 C.风力发电设备 D
最新回复
(
0
)