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MathGroup Archive 2006

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Re: Binomial Distribution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71370] Re: [mg71356] Binomial Distribution
  • From: Daniel Lichtblau <danl at wolfram.com>
  • Date: Thu, 16 Nov 2006 00:52:51 -0500 (EST)
  • References: <200611151145.GAA01517@smc.vnet.net>

Bruce Colletti wrote:
> Re Mathematica 5.2 under WinXP.
> 
> Why doesn't the code below return a rational number?  
> 
> X = BinomialDistribution[10, 6/10];
> F[x_] := CDF[X, x];
> Rationalize@F@4
> 
> Thankx.
> 
> Bruce

The direct question is how to find the rational value of 
BetaRegularized[2/5,6,5]. Rationalize works on explicitly approximate 
numbers, not on symbolic forms that happen to be rational. 
FunctionExpand will convert BetaRegularized[2/5,6,5] to 1623424/9765625.

Daniel Lichtblau
Wolfram Research


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