Web Reference: Dec 6, 2025 · The probability of an event E, denoted by P (E), is a number between 0 and 1 that represents the likelihood of E occurring. If P (E) = 0, the event E is impossible. View all of Khan Academy’s lessons and practice exercises on probability and statistics. The best example for understanding probability is flipping a coin: There are two possible outcomes—heads or tails. What’s the probability of the coin landing on Heads? We can find out using the equation P (H) =? . Learn the basics of probability, such as how to calculate the chances of an event happening, and how to use a probability line. Explore examples of experiments, outcomes, events, sample spaces, and sample points with dice and coins.
YouTube Excerpt: This is a re-upload to correct some terminology. In the previous version we suggested that the terms “odds” and “
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