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standard deviation and range

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by cooldude » Thu Nov 09, 2006 9:42 am
hi guys how is standard deviation and range r calculated?
can someone explain plz?

and can some one gimme list or any link wher i can lear wat topics, which are related to sd and range and satats etc, must be covered for gmat
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by beatthegmat » Thu Nov 09, 2006 7:09 pm
Standard Deviation problems are RARELY encountered on the GMAT. You probably won't see one on your test--that's why most GMAT Math books don't even cover this topic.

Here's a link to introduce you to how Standard Deviation is calculated: https://coe.sdsu.edu/eet/Articles/standarddev/index.htm

Don't worry too much about these problems or spend too much time studying for them!
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by cooldude » Thu Nov 09, 2006 9:13 pm
hey eric i came across them twice mean in each gmat prep :roll:

and people say bf cr question r hard and when u get it ur score is supposed to b good but man my very first question on verbal was bfcr :evil:
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by beatthegmat » Thu Nov 09, 2006 9:24 pm
cooldude wrote:hey eric i came across them twice mean in each gmat prep :roll:

and people say bf cr question r hard and when u get it ur score is supposed to b good but man my very first question on verbal was bfcr :evil:
Even though you saw two standard deviation problems in your GMAT prep, I still would argue that you will not likely see these questions on your actual GMAT. That said, it still is a good idea to understand how to do them--but devote more time to mastering the fundamentals (arithmetic, alegebra, geometry) that will DEFINITELY be tested.

Your statement about boldface questions is a myth. Boldface questions vary in difficulty, just like any other verbal question. Try not to read too much into your performance if you encounter an boldface question early or late in your verbal section.

Best of luck to you!
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by ianstrike » Sat Nov 18, 2006 12:35 pm
beatthegmat wrote: Even though you saw two standard deviation problems in your GMAT prep, I still would argue that you will not likely see these questions on your actual GMAT.
GMAC seems to test understanding WHAT standard deviation is far more than they test your ability to calculate standard deviation.
beatthegmat wrote:That said, ..... devote more time to mastering the fundamentals (arithmetic, alegebra, geometry) that will DEFINITELY be tested.
With respect to mastering the fundamentals, I couldn't agree more.

The key to getting an excellent GMAT score is NOT killing yourself to understand every esoteric topic. The key to breaking 700 is making certain that you nail every 'average difficulty' and every 'above average difficulty' question confidently and efficiently.

Plenty of people who can't do complex permutations still break 700. It's impossible to break 650 if you can't easily decode involved word problems.
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