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Average.GmatPrep.Mean of salary

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alpeshvc
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Average.GmatPrep.Mean of salary [#permalink] New post   30 Mar 2010, 20:28
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (03:53) wrong based on 1 sessions
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Tried to search for this problem in DS section, could not find.

Probably solution is easy, I am missing something here.





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Re: Average.GmatPrep.Mean of salary [#permalink] New post   30 Mar 2010, 22:54
we can solve this question using weighted averages.

The formula we use in weighted average is N1 / N2 = D2 / D1

In the given problem, N1 - Manger & D1 = 5000, N2 - Director & D2 = 15000

Now as per the formula

N1/N2 = D2 / D1 = 15000/ 5000 = 3 / 1

converting above number to percents we get 75% / 25 %

ie. Mangers = 75% , Directors = 25%..

Hence answer is C

Hope this will help..correct me if my reasoning is wrong!!!!!
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Re: Average.GmatPrep.Mean of salary [#permalink] New post   30 Mar 2010, 23:00
divakarbio7 wrote:
we can solve this question using weighted averages.
The formula we use in weighted average is N1 / N2 = D2 / D1
................................................
Hope this will help..correct me if my reasoning is wrong!!!!!


Wow, that was pretty cool.

I have just forgotten this formula of weighted average - N1/N2 = D2/D1. I can't seem to recollect it. Can you please shed some more light on it ? Like, what is N1, N2, & how it works ?

Thanks. :)
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Re: Average.GmatPrep.Mean of salary [#permalink] New post   30 Mar 2010, 23:24
Hi,

you can get more information about weighted average in Manhattan Book 5 - word translations - chapter 6.
For your reference i have attached the chapters.... ( refer weighted average 1 & 2 )
Attachments

Weighted Avergae2.gif
Weighted Avergae2.gif [ 51.88 KiB | Viewed 2728 times ]

Weighted Avergae1.gif
Weighted Avergae1.gif [ 50.48 KiB | Viewed 2724 times ]

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Re: Average.GmatPrep.Mean of salary [#permalink] New post   30 Mar 2010, 23:24
1
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Final one!!!!!
Attachments

Weighted Avergae3.gif
Weighted Avergae3.gif [ 42.59 KiB | Viewed 2727 times ]

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Re: Average.GmatPrep.Mean of salary [#permalink] New post   31 Mar 2010, 02:11
@ divakarbio7

Thanks for your fantastic efforts.
I still have some doubts if you can clear.

Let say the average salary is x, then managers salary is x-5000 and directors is x+15000

now you have taken the ratio of 15000 to 5000. now lets assume the managers salary is x+5000 in statement 1 (managers earn 5000 more than the average) and directors earn same x+15000. Then what would be the answer?

Can you please mention the formula with explanation. That would be very helpful!

Thanks
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divakarbio7
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Re: Average.GmatPrep.Mean of salary [#permalink] New post   01 Apr 2010, 04:03
hi

if we assume the average salary of Manager is 5000+, & as given Directors will be 15000+, then as per my knowledge we cannot use the weighted average formula.
However I am not sure as to how to solve your questions. sorry....

you can also refer below URL, where the same problem is solved in different approach
gmat-prep-test-92076.html
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Re: Average.GmatPrep.Mean of salary [#permalink] New post   01 Apr 2010, 04:32
divakarbio7 wrote:
hi

if we assume the average salary of Manager is 5000+, & as given Directors will be 15000+, then as per my knowledge we cannot use the weighted average formula.
However I am not sure as to how to solve your questions. sorry....

you can also refer below URL, where the same problem is solved in different approach
gmat-prep-test-92076.html



i got the solution i wanted on the link.
Thanks again



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Re: Average.GmatPrep.Mean of salary [#permalink]
01 Apr 2010, 04:32
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