Understanding Discrete Random Variables and Probability Distributions

The peaceful, cheerful people of Discretown are about to be roiled by a crisis of epic (by their standards) proportions. Can statistical and scientific thinking save the day?
Probability animation from Prof. Joe Blitzstein's HarvardX course Stat110x, now on edX! www.edx.org/co...
A Crisis in Discretown [discrete random variables probability animation, Binomial and Poisson]