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GmatPrep PS

by tolmar » Mon Jul 21, 2008 4:43 am
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.
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by Canman » Mon Jul 21, 2008 5:43 am
Looks like you may not have posted the entire problem.
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by tolmar » Mon Jul 21, 2008 8:20 am
Sorry for that. I've added the numbers.
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by sudhir3127 » Mon Jul 21, 2008 8:31 am
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
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