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# Which of the following procedures is always equivalent to

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Director
Joined: 06 Feb 2006
Posts: 897
Which of the following procedures is always equivalent to [#permalink]

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04 Jun 2006, 03:42
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Question Stats:

100% (02:51) correct 0% (00:00) wrong based on 1 sessions

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Which of the following procedures is always equivalent to adding 5 given numbers and then dividing the sum by 5?

I) Multiplying the 5 numbers and then finding the 5th root of the product.
II) Adding the 5 numbers, doubling the sum, and then moving the decimal point one place to the left
III) Ordering the 5 numbers numerically and then selecting the middle number

A) None
B) I only
C) II only
D) III only
E) I and III
Manager
Joined: 28 Mar 2006
Posts: 157

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04 Jun 2006, 10:50
C it is..take any sample..2,4,6,7,9...take a random one...wid both odd n enen ..n non consecutive....
adding u get 28...divide by 6= 5.6
28 * 2 = 56....move dec to left=== 5.6

cross check wid ne other sample to confirm
Director
Joined: 06 Feb 2006
Posts: 897

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04 Jun 2006, 23:40
Yes OA is C... but this approach requires at least 3 minutes i think.... But i guess there cannot be any other approach just pick and see....
SVP
Joined: 01 May 2006
Posts: 1796

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05 Jun 2006, 10:01
(N1 + N2 + N3 + N4 + N5)/5 = mean

1) no meaning

2) Moving decimal point 1 place by left is similar to divide by 10
=> 2*(N1 + N2 + N3 + N4 + N5) / 10 = (N1 + N2 + N3 + N4 + N5)/5

3) Ordering and taking the middle is like searching the median of 5 numbers which is not equal to the mean of 5 numbers

CEO
Joined: 20 Nov 2005
Posts: 2894
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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05 Jun 2006, 14:30
C

This one was not that difficult or time consuming.
We have S = Sum and we have to find S/5 i.e average

I is out even in a glance.
II is S *2 /10 which is S/5 i.e average
III is median not the average
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

VP
Joined: 02 Jun 2006
Posts: 1260
Re: Gmat paper test - PS # 3 [#permalink]

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05 Jun 2006, 15:59
I think it is C) II Only.

We are computing average of 5 numbers and if you double the sum and divide by 10 (equivalent to moving decimal point) then we have the answer.

The other options don't work..

I) Fifth root does not give a solution...
II) This is the correct solution
III) This is median not the average.

SimaQ wrote:
Which of the following procedures is always equivalent to adding 5 given numbers and then dividing the sum by 5?

I) Multiplying the 5 numbers and then finding the 5th root of the product.
II) Adding the 5 numbers, doubling the sum, and then moving the decimal point one place to the left
III) Ordering the 5 numbers numerically and then selecting the middle number

A) None
B) I only
C) II only
D) III only
E) I and III
Re: Gmat paper test - PS # 3   [#permalink] 05 Jun 2006, 15:59
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