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Can I define my ranking position out of the below information?

 
 
Reply Mon 18 Mar, 2013 09:20 am
My final GPA is 102. The diploma does however state only intervals as follows:
Grade -- Percentage of students gaining the grade
104-110cl -- 10%
96-103 -- 25%
90-95 -- 33%
86-89 -- 22%
66-85 -- 11%

I do not have information on the standard deviation or the number of observations. Is there a ways to narrow down the interval in which I am ranked with the information presented above?
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engineer
 
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Reply Mon 18 Mar, 2013 11:05 am
@lambadamanja,
Yes, you can compute the z score for each of the boundard conditions below, fit a straight line through the data, find the z-score for your score on that line then find the probability that corresponds to. This assumes normality. If the line isn't very straight, then this isn't a good assumption. One challange is defining the boundary conditions. Is 104 the 90th percentile or is it 93? (I'd use 93.5) I tried it for fun. Here are the z-scores:

103.5 1.281551566
95.5 0.385320466
89.5 -0.439913166
85.5 -1.22652812

That makes a decent line and your percentile would be 87.6%
engineer
 
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Reply Mon 18 Mar, 2013 12:13 pm
@engineer,
Quote:
Is 104 the 90th percentile or is it 93? (I'd use 93.5)

I meant 103 and 103.5.
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lambadamanja
 
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Reply Tue 19 Mar, 2013 07:47 am
@engineer,
Thanks for your help!
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