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(a)mean = 79 (b)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

Thiskindofcomputeris________handlingallkindsofinformation.

Lifeasawomaninthecolonial(殖民的)Americaseemsquitedifferentfromitistoday.Womenwereconsideredinferiortomen,afac

Hehasbeencalledthe"missinglink."Half-man,half-beast.Heissupposedtoliveinthehighestmountainintheworld-

Hehasbeencalledthe"missinglink."Half-man,half-beast.Heissupposedtoliveinthehighestmountainintheworld-

Morethan30,000driversandfrontseatpassengersarekilledorseriouslyinjuredeachyear.Atthespeedofonly30milesper

Youfeelhappiestwhenyoucreateahealthybalancebetweengivingandreceiving.Ifyougiveandgivewithoutmakingtimetofi

Youfeelhappiestwhenyoucreateahealthybalancebetweengivingandreceiving.Ifyougiveandgivewithoutmakingtimetofi

Studentsareexpectedto______theirclassesregularly.

Weallknowthatitispossibleforordinarypeopletomaketheirhomesontheequator,althoughoftentheymayfeeluncomfortab

Whatisthey-interceptofthelinewiththeequation2y=4x+6?

如果一个追随者的独立性较强，工作水平高，那么采取()的领导方式是不适宜的。

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