请教4道GMAT数学题,我不需要几个字母啊,
Q2:
Acertaincharacteristicinalargepopulationhasadistributionthatissymmetricaboutthemeanm.If68percentofthedistributionlieswithinonestandarddeviationdofthemean,whatpercentofthedistributionislessthanm+d
A.16%
B.32%
C.48%
D.84%
E.92%
Q24:
FactorPercentofRespondents
User-friendly56%
Fastresponsetime48%
Bargainprices42%
ThetablegivesthreefactorstobeconsideredwhenchoosinganInternetserviceproviderandthepercentofthe1,200respondentstoasurveywhocitedthatfactorasimportant.If30percentoftherespondentscitedboth“user-friendly”and“fastresponsetime,”whatisthemaximumpossiblenumberofrespondentswhocited“bargainprices,”butneither“user-friendly”nor“fastresponsetime?”
A.312
B.336
C.360
D.384
E.420
Q28:
Aschooladministratorwillassigneachstudentinagroupofnstudentstooneofmclassrooms.If3