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Invisible wrote:
> More usefully for you, the cumulative probability - the probability of K
> heads OR LESS, is given by
>
> I[1 - P(H)] (N - K, N + K)
>
> where I[x](a, b) represents the regularised incomplete beta function,
>
> http://en.wikipedia.org/wiki/Regularized_incomplete_beta_function
http://reference.wolfram.com/mathematica/ref/BetaRegularized.html
So Wolfram Alpha will compute it, for example.
But that doesn't matter:
http://office.microsoft.com/en-us/excel/HP052090051033.aspx
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