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What is the average (arithmetic mean) height of the n people in a certain group?
(1) The average height of the n3 tallest people in the group is 6 feet 212 inches, and the average height of the rest of the people in the group is 5 feet 10 inches.
(2) The sum of the heights of the n people is 178 feet 9 inches.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
完善解答 
暂无雷哥网文字解析
小良冠二郎
错选d，因为n是未知数......
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2023-03-15 13:41:10
小良冠二郎
错选c，因为n是未知数......
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2023-03-15 13:40:53
可欣同学
这题错的，我都被自己逗笑了，n是未知数呵呵。
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2020-10-09 16:14:02
哩哩回复可欣同学
n竟然是未知数。。。死亡
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2020-10-18 11:29:09
1406554cd
解法：因为n/3的人的mean是6 feet（后面的inches完全可以忽略，不影响计算），那么剩余的人数就是2n/3，这群人的mean是5 feet。 所以，总人数的身高合计：6 x（n/3）+ 5 x（2n/3），mean就除以 n，可以把n消掉，所以条件一：充分。 条件二不知道总人数，所以无法算，不充分。
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2019-12-14 23:18:10
285622ymfu
不明白为什么不选A。。。这题和n是什么没有关系，有A的条件就能算了啊。。。
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2019-10-25 01:48:55
VC FIGHT回复 285622ymfu
这题不就是选A吗？
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2022-08-26 09:15:33
297463ej
The 2 statement is ambiguous. It should be put like this : the sum of heights of people in certain group is xxx . How r u supposed to know the n is know or unknown. Doubt this’s from GMAC :-//////
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2019-10-13 03:16:34
847716opn
第一个n可以被消掉，第二个是未知数
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2019-10-01 16:47:28
这有一个西柚婶婶720
N是未知数！
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2019-06-18 14:50:11
shs
只想问那个（1/2）【3/4】inchs是啥意思？莫名其妙的怪题
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2019-04-10 14:55:15
阿十八大哦不准备
那你他么告诉我n干什么。。。。。。。。
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2019-04-01 14:59:53
Kath1230
n是未知的 我头大
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2019-02-07 17:36:07
mangokiwi213
It's totally a trap.....!!!!==!!!!! (1)avg height=(n/3*平均身高1+2n/3*平均身高2）/n，n可以直接被消掉 (2)avg height=总身高/n n未知！！！！ 所以选A啊！！！不要选D啊 ！！！！ （内心os：纳尼 那你告诉我n干什么！！）
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2018-08-24 15:42:17
Mmmmm回复mangokiwi213
hhhhhhh calm down pls
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2018-11-14 02:43:47
Horacejin回复mangokiwi213
淡定
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2019-05-14 15:48:42
TinaT
实在是看不懂
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2018-08-15 16:47:08
悬铃子小姐
分享(1) The average height of the n/3 tallest people in the group is A inches, and the average height of the rest of the people in the group is B inches.
总高度/人数={ A* (n/3) + B*（2n /3）} / n，n可以被约掉
(2) The sum of the heights of the n people is 178 feet 9 inches.
mean本来是总高度/人数，但是这里n未知
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2018-07-17 00:13:22
悬铃子小姐
(1) The average height of the n/3 tallest people in the group is A inches, and the average height of the rest of the people in the group is B inches.
总高度/人数={ A* (n/3) + B*（2n /3）} / n，n可以被约掉
(2) The sum of the heights of the n people is 178 feet 9 inches.
mean本来是总高度/人数，但是这里n未知
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2018-07-17 00:13:08
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