Mean and variance of a negative binomial distribution

[@夜絳紅]

Thanks for your video :) It helps me understand how do the mean and variance of negative binomial distribution comes from :)

[@KATEREGGAERICK-r6h]

Sorry but yr formula differs mean=r(1-p)/p
Variance= r(1-p)/p'2

[@ChristianTv216]

We can’t what you are doing