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In a given class, what is the average (arithmetic mean) height per pup

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In a given class, what is the average (arithmetic mean) height per pup [#permalink]

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New post 17 Dec 2014, 06:41
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Tough and Tricky questions: Word Problems.



In a given class, what is the average (arithmetic mean) height per pupil ?

(1) The average (arithmetic mean) height of the girls in the class is 61 inches.
(2) The average (arithmetic mean) height of the boys in the class is 64 inches.

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[Reveal] Spoiler: OA

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Re: In a given class, what is the average (arithmetic mean) height per pup [#permalink]

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New post 17 Dec 2014, 07:05
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1. No info on number of girls and no.of boyz . so mere average doesnt give you the class average Insufficient

2. Same as above Insufficeint.

1+2>>we have here avg height of boys and girls but we dont know the total number of boys and girls to calculate the complete average,

Insufficient.
Ans E
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Re: In a given class, what is the average (arithmetic mean) height per pup [#permalink]

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New post 20 Dec 2014, 09:31
Solution: To determine the average (arithmetic mean) height per pupil, we need the heights of all people or mean height of girls & boys and their ratio.

Statement 1: The average (arithmetic mean) height of the girls in the class is 61 inches
As we don't know the average height of boys, this statement alone is insufficient

Statement 2: The average (arithmetic mean) height of the boys in the class is 64 inches
As we don't know the average height of girls, this statement alone is insufficient

Combining 1 & 2, still we don't know the exact number of boys and girls or their ratio, we can't determine the average of the group.
Answer E
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Re: In a given class, what is the average (arithmetic mean) height per pup [#permalink]

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New post 19 May 2016, 12:52
If there was any problem which was screaming the need for ratio , this would have been the very problem the person should see :wink: :wink:

Statement 1 tells us the average height of girls in class
We don't have any info on boys in the class So clearly insufficient

Statement 2 tells us the average height of boys in class
We don't have any info on girls in the class So clearly insufficient

combining both statements we still don't have any information on number of boys and girls individually or even a ratio of number of boys to number of girls

So Correct Answer - E
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Re: In a given class, what is the average (arithmetic mean) height per pup [#permalink]

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New post 13 Jan 2018, 05:29
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: In a given class, what is the average (arithmetic mean) height per pup   [#permalink] 13 Jan 2018, 05:29
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