fifan wrote:
Hi Carcass
If Charlie out scored 25 students then his score must be the 26th score or the first in the 6th percentile. Why is 5th percentile the average of 25th and 26th score? Why it is not the 26th score below which 5% of the scores or 25 values lie? Some user above has calculated the position of the 5th percentile as 5/100 *501 =25.05. Why is 1 added to the total?
I'm not crazy about question D.
From what I've read in ETS's GRE literature, it's unclear how the GRE treats the calculation of percentiles when it comes down to the finer points.
For example, in the set of ages {1, 2, 3, 4, 5}, some will say that the age of 3 is a 40th percentile age (since 3 is greater than 40% of the ages), while others will insist that 2.5 (the average of 2 and 3) is a 40th percentile age.
So, for example, let's say the first 27 scores (out of 500 scores) are: 1,1,1,1,1,1,1,1,2,2,3,3,4,4,5,5,6,6,6,6,7,7,7,7,8,
9,10
The 26th score is
9So,there are 25 scores less than
925/500 = 5%, so some would say that
9 is a 5th percentile score.
Others will say that 8.5 is the 5th percentile score.
I don't believe I've seen an official GRE question that hinges on the one concept.