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Percentiles

by MBA.Aspirant » Fri Jun 24, 2011 7:14 am
The random variable x is normally distributed. The values 650 and 850 are at the 60th and 90th percentiles of the distribution of x respectively. What's the value of the 75th percentile of the distribution of x?
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by vikram4689 » Fri Jun 24, 2011 5:25 pm
normal distribution - dont know if it there on gmat or not.

Well whats the answer 750 ??
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by Brent@GMATPrepNow » Fri Jun 24, 2011 7:42 pm
Normal Distributions are not tested on the GMAT.
However, they are tested on the new GRE - beginning in August.

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by MBA.Aspirant » Sun Jun 26, 2011 11:58 pm
The answer is that the 75th percentile is < 750. As the difference between the higher percentiles (say 90th - 75th) is higher than the difference between the lower ones (75th - 65th) then:

75th - 650 < 850 - 75th

2 75th < 1500

75th value < 750
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