A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72. (a

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问题 A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72.
(a)What is the mean of the 50 values?
(b)What is the median of the 50 values?

选项

答案The median cannot be determined from the information given.

解析

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A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72. (a

GRE QUANTITATIVE

GRE

Thefactoryhadto______anumberofemployeesbecauseoftheeconomiccrisisinthecountry.

Wehavealwaysthoughtvery______ofhim.

BythetimeIfinishedhighschool,myinterestinanimalshadgrown,andenrolledatauniversitytostudybiology.Ilearneds

Inmakingmarketinvestigation,oneshould______.Allthefollowingarechannelstogetmarketinformationexcept______.

Whatyou’realwaysheard?We’reeatingtoomuchsalt.TheaverageAmericangetsabout3.4gramsofsodiumeveryday,farmoreth

Accordingtoarecentsurvey,employeesinmanycompaniestodayworklongerhoursthanemployeesdidin1979．Theyalsotakeshor

Theresultsofthesurveyareinterestingandthey______morequestionsthantheycananswer.

Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases

Woman:DoyougetthePublicBroadcastingSystemonTV?Man:Yes,everybodygetsPBS.【D5】______Woman:It’sboringandof

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