首页
登录
职称英语
For a certain distribution, the measurement 12.1 is 1.5 standard deviations belo
For a certain distribution, the measurement 12.1 is 1.5 standard deviations belo
游客
2024-01-12
50
管理
问题
For a certain distribution, the measurement 12.1 is 1.5 standard deviations below the mean, and the measurement 17.5 is 3.0 standard deviations above the mean. What is the mean of the distribution?
选项
A、13.8
B、13.9
C、14.0
D、14.1
E、14.2
答案
B
解析
If m represents the mean of the distribution and s represents the standard deviation, then the statement "the measurement 12.1 is 1.5 standard deviations below the mean" can be represented by the equation 12.1 = m - 1.5s. Similarly, the statement "the measurement 17.5 is 3.0 standard deviations above the mean" can be represented by the equation 17.5 = m +3.0s.
One way to solve the two linear equations for m is to eliminate the s. To do this, you can multiply the equation 12.1 = m - 1.5s by 2 and then add the result to the equation 17.5 = m + 3.0s to get 41.7 = 3m. Solving this equation for m gives the mean 13.9. Thus the correct answer is Choice B.
This explanation uses the following strategy.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
转载请注明原文地址:https://tihaiku.com/zcyy/3355467.html
相关试题推荐
Acertainairportsecurityscannerdesignedtodetectexplosivesinluggagewill
Manystatelegislaturesareconsideringproposalstotheeffectthatcertainpol
Themostwidelyusedtherapyforacertaintypeofulcercompletelyhealssuchu
AuthoritiesinCaliforniarequireddriverstousetheirheadlightsonacertain
AcertaintypeofdinnerwaremadeinGanandiacontainslead.Leadcanleachinto
Acertaintypeofshrimphabituallyhoversaroundsuperheateddeep-seageysers,
Scientistshaverediscoveredcertainfoodcrops,oncecommonlycultivatedinthe
Aworldwidebanontheproductionofcertainozone-destroyingchemicalswouldpr
Computeroperatingsystemsoftwarehasbecomeincreasinglystandardized.Butwhe
Neitherarisingstandardoflivingnorbalancedtrade,byitself,establishesa
随机试题
MembersofParliamentarerequiredto______alltheirfinancialinterests.A、dis
Oneafternooninthesummerof1989,a27-year-oldfoodtechnologist,ca
Wefeellike_____________(截获了正在全速驶向珍珠港的日本航空母舰).wecaughttheJapancarrierste
B
导游工作的特点要求导游人员应该具有( )的性格。A.活泼外向 B.安静内敛
具有分支菌酸的细菌是A.星型诺卡菌B.衣氏放线菌C.流感嗜血杆菌D.产气荚膜梭菌
(2013年初)下列各项中,属于全国人民代表大会预算管理职权的有( )A.审查中
桑代克的学习理论被称为()。A.尝试一错误说 B.认知发现理论 C.联结认
下列社会关系属于民法的调整对象的有()。A.自然人甲与自然人乙之间订立的电
一家公司准备实施一个大型建设项目的管理任务。为提高项目组织系统的运行效率,决定设
最新回复
(
0
)