Hi,



I found follwowing example of pnorm here:

http://www.r-tutor.com/elementary-statistics/probability-distributions/normal-distribution



Problem

Assume that the test scores of a college entrance exam fits a normal
distribution. Furthermore, the mean test score is 72, and the standard
deviation is 15.2. What is the percentage of students scoring 84 or more in
the exam?



Solution

> pnorm(84, mean=72, sd=15.2, lower.tail=FALSE)

[1] 0.21492



That is straight forward, however what if I want to know the score the best
30% students are reaching at least. So I know the solution of pnorm but
want to know its q. How can that be achieved in R?



Any suggestions?



/Johannes

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