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Negative Binomial Distribution
P(X=x)  =  (  x1
k1

)  (1p)^{xk} p^{k} 
P(k, r)  =  (  k+r1
k1

)  (1p)^{r} p^{k} 
x>0, k>0, x≥k, r≥0, 0<p<1; x = k + r
Probability of success in one trial:p =
Number of successes:k =
P(X = x):
P(X ≤ x):
P(X ≥ x):
Mean:
Negative Binomial Distribution Calculator is a free online tool for calculations of probabilities of events following negative binomial distribution.
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