Khan Academy
The Khan Academy is a not-for-profit organization with the goal of changing education for the better by providing a free world-class education to anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge.
These videos will help you develop foundational skills in both areas of probability and statistics.
Whenever we’re unsure about the outcome of an event, we can talk about the probabilities of certain outcomes (how likely they are). The analysis of events governed by probability is called statistics.