objective c - math.h - z-score from percentile -

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i'm building app in objective-c ios requires statistics calculations. read on this thread how calculate percentile value, how going in opposite direction?

i have percentile, , need z-score (their example uses 5th percentile corresponds -1.645). math.h function w/ formula can use?

you need use inverse cdf of normal distribution after: http://en.wikipedia.org/wiki/inverse_gaussian_distribution

i did search has written in objective c , can't find it. can adapt code here though: http://home.online.no/~pjacklam/notes/invnorm/


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