Some of the great concepts found in first few chapters of Statistics and problem solving book are:
1. If all the terms of a set are INCREASED by a constant number, then the new mean will be equal to what?
2. If all the terms of a set are DECREASED by a constant number, then the new mean will be equal to what?
3. If all the terms of a set are MULTIPLIED by a constant number, then the new mean will be equal to what?
4. How will the Standard Deviation vary if we multiply each term of a set with an absolute value greater than 1 or less than 1?
5. How will the Standard Deviation vary if we Divide each term of a set with an absolute value greater than 1 or less than 1?
6. What effect it would have on standard deviation if we change the sign of all terms (or in other words multiply by -1)
7. Can SD be bigger than half of the range?
This book implores you to think from different angles. There are lots of What if scenarios covered in the book. I hope I am not violating any copyright information in this post. Moderator, please feel free to edit this post if you observe any copyright violation information.
If you have around 3 months to prepare for GMAT, then it wouldn't hurt to add these books in your Armour especially now when you can buy these books individually (if I am right).
- getmba