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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