Negative Binomial Distribution Mean and Variance

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In this video I derive the mean and variance of the Negative Binomial Distribution. I make use of the relationship between the Geometric(p) and the Negative Binomial(r,p) distribution.
This video shows how to derive the mean and variance of a Negative Binomial Distribution that is written as the sum of r independent identically distributed Geometric Random Variables.
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Introduction: 0:00
Deriving the Mean: 1:54
Deriving the Variance: 04:41

BoerCommander
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So the mean of negative binomial distribution is r/p?

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