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DS / averages

Expert replies
by smallsorrow » Mon Nov 03, 2008 2:40 am
What is the average height of the n people in the group?

1) height of n/3 tallest people in the group is 6ft2.5inches and average height of the rest is 5ft10inches

2)The sum of n is 178ft9inches


Here is my reasoning:
2) does not work alone

1) combined average: ((n/3)(6ft2.5) + (3)(5ft10))/n ??? does this work ?

Thanks for an answer...
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Source: — Data Sufficiency |

Re: DS / averages

by stop@800 » Mon Nov 03, 2008 9:42 am
smallsorrow wrote:What is the average height of the n people in the group?

1) height of n/3 tallest people in the group is 6ft2.5inches and average height of the rest is 5ft10inches

2)The sum of n is 178ft9inches


Here is my reasoning:
2) does not work alone

1) combined average: ((n/3)(6ft2.5) + (3)(5ft10))/n ??? does this work ?
Yes, It shud.
Do you have different OA?

A small correction, though it will not impact your answer.
(3)(5ft10)
should be
(2n/3)(5ft10)

finally both n's will cancel.
Thanks for an answer...
Join the discussion

by smallsorrow » Tue Nov 04, 2008 5:38 am
A is correct!
Thanks - with DS I am still unsure from time to time... :-)
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