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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本试题收录于： GRE QUANTITATIVE题库GRE分类

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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

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GRE

Jim’sjobistokeephisboss______ofthelatestdevelopmentofthatproductinEurope.

Ourpreferencesforcertaincolorsare______accordingtothepassage.Ifpeopleareexposedtobrightred,whichofthefollo

Themaincauseofpollutionis______.Whichofthefollowingcannothelpsolvingtheproblemofpollution?

Whatdoestheauthormeanbysaying"theyknowbetternow?"Whichofthefollowingisthemostappropriatetitleforthepassag

Humanbeingshavealwayshadanabilitytoattendtoseveralthingsatonce.(78)Noriselectronicmultitaskingentirelynew:W

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

Tom______theshopkeeperwithovercharginghimforthearticleshehadbought.

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IntriangleABCabove,if∠BADand∠ADBhavemeasuresof4n,∠ACBhasameasureofn,and∠DBChasameasureof45°,whatisthe

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