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Which of the following procedures is always equivalent to

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Director
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Which of the following procedures is always equivalent to [#permalink] New post 04 Jun 2006, 02:42
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (02:51) correct 0% (00:00) wrong based on 1 sessions
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
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 [#permalink] New post 04 Jun 2006, 09:50
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
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 [#permalink] New post 04 Jun 2006, 22:40
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....
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 [#permalink] New post 05 Jun 2006, 09:01
(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

Answer (C)
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 [#permalink] New post 05 Jun 2006, 13:30
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
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Re: Gmat paper test - PS # 3 [#permalink] New post 05 Jun 2006, 14:59
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, 14:59
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Which of the following procedures is always equivalent to

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