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- Jul 16, 2006
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There's been many posts about figuring out the percentile of someone's score given the mean and SD.
Hope this could settle the confusion once and for all.
Here's a calculator for percentile:
http://bayes.bgsu.edu/nsf_web/jscript/normal_cdf/normal_icdf.htm
On the left, put in the mean and SD.
On the right, under PROBABIILITY, input the percentile in decimle points. Like .90 for 90th%tile, .30 for 30th%tile
then click COMPUTE X, it will tell you the score that corresponds to the percentile you input.
For exmple, COMLEX mean 500, SD 79, using probabilty .90, then x = 601.
So a 601 corresponds to a 90th%tile.
Hope this could settle the confusion once and for all.
Here's a calculator for percentile:
http://bayes.bgsu.edu/nsf_web/jscript/normal_cdf/normal_icdf.htm
On the left, put in the mean and SD.
On the right, under PROBABIILITY, input the percentile in decimle points. Like .90 for 90th%tile, .30 for 30th%tile
then click COMPUTE X, it will tell you the score that corresponds to the percentile you input.
For exmple, COMLEX mean 500, SD 79, using probabilty .90, then x = 601.
So a 601 corresponds to a 90th%tile.