F20 Probability Lecture 24: A Little About Negative Hypergeometric and Poisson Distributions

We take a quick look at Negative Hypergeometric and Poisson Distributions

[mihaidumitrescu]

Thank you very much for the explanation of the expected value of NHypergeom. The splitting into smaller problem really well explained.
The only think that was confusing was that in X1 we were talking about the # of black balls extracted before the 1st white ball.
However, in the indicator r.v. composing X1 (Y1k), computing the probability depends on the position of all the white balls (so, not just the 1st one we have just "fixed").

After this step everything is arithmetic.
Thank you again :)

P.S. I will be watching more lectures :)