1. Standard Deviation gives the dispersion or spread of the data around its mean

* simply means that if standard deviation is large data is spread over a greater range around mean...or a lot of the data points are not close to the mean value

2. Adding or Subtracting a constant value from each term in the set has

**NO EFFECT ON SD**

**3.**If each term in the set is multiplied by a number > 1 then SD increases

4. If each term in the set is multiplied by a number < 1 then SD decreases

5. If each term divided by a number > 1 then SD decreases

6. If each term divided by a number > 0 but number < 1 then SD increases .

let us say we divide each term by number 'n' , 0 < n < 1 then SD increases

7. Changing the sign of all terms in set has no bearing on SD..

8. If you are given multiple sets of numbers and you have to find out the set with largest and smallest SD just look at the set where the difference between the terms is greatest and the set where the difference between the terms is smallest respectively..

{ i hope the wording is not confusing, i know it sucks brevity per se :) }

## 5 comments:

hi,

I've gone through ur posts on PagalGuy. Pls share the study materials wid me...

I took 6-Manhattan Mock tests and my score is in the range 680-720...:(

I'm aiming for something in the range of 730-750. Pls advice regarding hte prepration.

I'm planning to take GMAT by month end Jan-2010

can you pls share ur e-mail id wid me??

Hi,

Congrats on ur score. Went thru ur post on pagalguy so that leads me here. Need advice from someone with ur kinda score,so i hope u can help me out. Anyways wrote my first mock yesterday(Gprep1) and got a lousy 630. So as of now took a two month leave from my job for feb and march and hopin to be done with GMAT in this duration. Please advice me on how to prepare and what all stuff to follow. Would be great if you could send me a detailed mail if possible( rafay.salman@gmail.com).

Hi Braveheart.

I am starting prep for GMAT from this month.

Would be gratefull if you could provide your Study material at below ID:

amitbluesky@indiatimes.com

Hi,

Could you also kindly send the study material to anantalokvarma@gmail.com

Many Thanks!

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