View all of Khan Academy’s lessons and practice exercises on probability and statistics here.

Learn statistics and probability—everything you'd want to know about descriptive and inferential statistics.

You've experienced probability when you've flipped a coin, rolled some dice, or looked at a weather forecast. Go deeper with your understanding of probability as you learn about …

Probability and combinatorics are the conceptual framework on which the world of statistics is built. Besides this important role, they are fascinating, fun, and often surprising!

This formula is derived from the definition of conditional probability and helps in calculating joint probabilities of dependent events.

We can build a formula for this type of problem, which is called a binomial setting. A binomial probability problem has these features:

Practice Probability with permutations and combinations Get 3 of 4 questions to level up!

This introduction to probability and statistics explores probability models, sample spaces, compound events, random samples, and a whole lot more.

You can prove that if P (A|B) = P (A) then P (B|A) = P (B). (proof is fairly straightforward, just use the definition of conditional probability) So knowing P (A|B) = P (A) is enough to prove …

Develop probability distributions: Theoretical probabilities Get 3 of 4 questions to level up!