squeak-
Can you pick different parameters? The average length of a phone call is 15 seconds?
Furthermore, if you want to simulate the length of each call, I nead some random numbers (or I can have Excel generate them for me). Could you also find the inverse of F(x) for me (for the Gamma Function)? I never did it before and wouldn’t be surprised if it doesn’t exist in closed form.
I don’t use the hypergeometric distribution on a daily basis so this part might take some extra time (you didn’t stump me though).