What is Probability?
April 12, 2026 • 10 min read • Math
Probability measures the likelihood of an event occurring, expressed as a number between 0 (impossible) and 1 (certain). This guide explains how to calculate probability and apply it to real-world situations.
P(A) = Number of Favorable Outcomes ÷ Total Number of Outcomes
Example: Coin Flip
Probability of heads = 1 (favorable) ÷ 2 (total) = 0.5 or 50%
Independent vs Dependent Events
Independent events don't affect each other. Dependent events do. Multiply probabilities for independent events occurring together.
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