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
2025-02-23
8
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/3970029.html
相关试题推荐
Acertainspiralstaircaseisdesignedsothateachstepafterthefirstoneis
If65percentofthepeoplewhopurchaseacertainmodelofacararemale,what
RecommendedMaintenanceScheduleforaCertainAuto(GiveninMiles)[img]2014m5x
RecommendedMaintenanceScheduleforaCertainAuto(GiveninMiles)[img]2014m5x
Acertainshippingservicechargesaninsurancefeeof$0.75whenshippinganyp
Acertainstoresellstwotypesofpens:onetypefor$2perpenandtheothert
Ofthe700membersofacertainorganization,120arelawyers.Twomembersofth
Therangeoftheheightsofthefemalestudentsinacertainclassis13.2inche
Forwhichofthefollowingbirdspeciesisthestandarddeviationofthenumbers
Thefirstterminacertainsequenceis1,the2ndterminthesequenceis2,an
随机试题
Effortistheessenceofhappiness:thereisnohappinessexceptaswetake
(1)Humanmigration:thetermisvague.Whatpeopleusuallythinkofisthep
Therearemanyargumentsforandagainsttheinterviewasaselectionproced
OnUpdatingKnowledge1.在现代社会,更新知识很重要2.更新知识的途径多种多样3.我的观点On
Impressionismisaformofartthatbeganinthe1870’s.Whenyoulookclose
关于地面找平施工的说法,正确的是( )。A.在松散的填充料上宜直接铺设找平层
2014-58、FTP在进行文件传输时需进行身份验证,如果以匿名方式登录,其用户
下列关于蛋白质紫外吸收特征的叙述错误的是A.因含有脂肪族氨基酸B.因含有色氨酸和
服务是一方能够向另一方提供的,基本上无形的任何活动或作业,结果不会导致任何所有权
仲裁当事人自行和解达成和解协议后,仲裁庭应当根据和解协议作出仲裁裁决书。()
最新回复
(
0
)