Lesson: Data Interpretation Strategies

Comment on Data Interpretation Strategies

http://gre.myprepclub.com/forum/9-changes-in-the-value-of-imports-between-consecutive-1797.html

I didn't understand question itself, are they asking mean?
when calculated mean approximately i found it as 480 million.

Can you please explain, whether they are asking average or change?
greenlight-admin's picture

Link: http://gre.myprepclub.com/forum/9-changes-in-the-value-of-imports-betwee...

The question SUGGESTS that we find the CHANGES between every pair of consecutive years.

So, from 2000 to 2001, the imports DECREASE from approximately 3.3 billion to 2.7 billion. This represents a CHANGE of -0.6 billion dollars.

From 2001 to 2002, the imports INCREASE from approximately 2.7 billion to 3.4 billion. This represents a CHANGE of +0.7 billion dollars.

From 2002 to 2003, the imports INCREASE from approximately 3.4 billion to 3.9 billion. This represents a CHANGE of +0.5 billion dollars.

etc...

We COULD continue with these calculations and then find the average of all of the 9 CHANGES.

However, we can see that the sum of all 9 CHANGES will be the same as the CHANGE from 2000 to 2009

From 2000 to 2009, the imports INCREASE from approximately 3.3 billion to 9.0 billion. This represents a CHANGE of 5.7 billion dollars.

(5.7 billion dollars)/9 ≈ 0.633 billion dollars
= 633 million dollars

http://gre.myprepclub.com/forum/number-of-military-personnel-by-gender-and-branch-2340.html#p10421

In 3rd question, they are asking how many women need to be added to army so that fraction of women army will be equal to fraction of women in air force?, anything wrong in my understanding of question.

how to solve this problem?
greenlight-admin's picture

I'm not fond of this question.
Please see my post here: http://gre.myprepclub.com/forum/number-of-military-personnel-by-gender-a...

https://www.youtube.com/watch?v=ZQylQnc9WhM

Hi!

I solved this assuming the original number of animals to be 100, and new number to be 108. And then bobcats as 24% of 108. What is wrong with this approach?
greenlight-admin's picture

Question link: https://www.youtube.com/watch?v=ZQylQnc9WhM

The problem with that approach is that we don't know the original number of animals. In fact, that's pretty much what we're asked to do.

If we use 100 for the original number of animals, then we ORIGINALLY have 32 lions and 8 tigers.
Once we add 8 tigers, we get 32 lions and 16 tigers, HOWEVER, we're told that the NEW ratio of lions to tigers is 4 to 3, and 32 lions and 16 tigers is NOT in a 4 to 3 ratio.

Cheers,
Brent

Hi Brent,

This is one question that has somewhat confused me. Could you please explain to me how the answer is 8.

https://gre.myprepclub.com/forum/which-of-the-following-could-be-the-median-length-of-unemplo-1880.html

Thanks,
Ketan
greenlight-admin's picture

https://gre.myprepclub.com/forum/among-the-50-african-countries-represented-in-the-chart-abov-11259.html

Could you explain how they got the answer?

Hi, what should be the approach for 3rd question
https://gre.myprepclub.com/forum/number-of-military-personnel-by-gender-and-branch-2340.html
greenlight-admin's picture

I explain why question #3 is a faulty question here: https://gre.myprepclub.com/forum/number-of-military-personnel-by-gender-...

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