I'm not sure this is right, since the inverse cdf: returns a value x such that cdf(dist(N,p), x) == P.
I'm trying to find 'p'. And if I understand it correctly the examples of the inverse cdf still have to specify p first.
Apologies I read your post too quickly - if you want the success faction then see http://www.boost.org/doc/libs/1_55_0/libs/math/doc/html/math_toolkit/dist_re... and www.boost.org/doc/libs/1_55_0/libs/math/doc/html/math_toolkit/dist_ref/dists/binomial_dist.html#math_toolkit.dist_ref.dists.binomial_dist.lower_bound_on_the_success_fract Pay particular attention to the different methods used and the linked references and discussions as some methods are particular adept at returning "wrong" answers. Hopefully I've answered the question you actually asked this time ;-) John.