NEGBINOMDIST function

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NEGBINOMDIST

Calculates probabilities for a negative binomial distribution.

Syntax:

NEGBINOMDIST(x; r; p)

For independent trials each with a probability p of success, NEGBINOMDIST returns the probability that there will be exactly x failures before there have been r successes. The formula used is:
Calc negbinomdist equation.png

Example:

NEGBINOMDIST(1; 1; 0.5)

returns 0.25 (25%), the probability that heads will come up exactly once, before tails has come up, when tossing a coin.


See Also
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