Revised-GRE QUESTION
I know how to evaluate the standard deviation and mean and also I have basic knowledge about the bell curve. But whenever I have to solve some problems related standard deviation within very short amount of time, its very hard to calculate in details.
For example:I have to find out that standard deviation from which chart is bigger , or are they equal?
Therefore I want to know how to have a good insight to get right these questions without doing lengthy equation?
