| View previous topic :: View next topic |
| Author |
Message |
tolmar
Rising GMAT Star
Joined: 12 Jul 2008
Posts: 39
Thanks given: 6
Thanked 0 times in 0 posts
|
 Posted: Mon Jul 21, 2008 4:43 am Post subject: GmatPrep PS |
 |
|
40, 45, 45, 50, 50, 60, 70, 75, 95, 100
The scores on a certain history test are shown above. how many scores were greater than the median score but less than the mean score?
A. None
B. One
C. Two
D. Three
E. Four
OA is B.
The mean is no problem, but is there a quick way to find out the average? thanks in advance.
Last edited by tolmar on Mon Jul 21, 2008 8:16 am; edited 1 time in total |
|
| Back to top |
|
 |
|
|
Canman
Rising GMAT Star
Joined: 11 Jul 2008
Posts: 58
Thanks given: 0
Thanked 4 times in 4 posts
Test Date: 8/16/2008
Target GMAT Score: 730+
|
| Posted: Mon Jul 21, 2008 5:43 am Post subject: |
|
|
| Looks like you may not have posted the entire problem. |
|
| Back to top |
|
|
tolmar
Rising GMAT Star
Joined: 12 Jul 2008
Posts: 39
Thanks given: 6
Thanked 0 times in 0 posts
|
| Posted: Mon Jul 21, 2008 8:20 am Post subject: |
|
|
| Sorry for that. I've added the numbers. |
|
| Back to top |
|
|
sudhir3127
Moderator
Joined: 07 Jul 2008
Posts: 785
Thanks given: 0
Thanked 59 times in 55 posts
Location: INDIA
Target GMAT Score: 700+
|
| Posted: Mon Jul 21, 2008 8:31 am Post subject: |
|
|
i dont know of any formula or quick way of getting the averages but u can use the following method.. i am not sure how far will it be helpful...
take 60 out
60 + ( -20-15-15-10-10+0+10+15+35+40)/10
if u see the above u can cancel +35 and -20 and -15 , -15 and +15 , -10 and +10, so ur left only with +40 and -10.
60 +30/10= 63
hope it helps |
|
| Back to top |
|
|
|
