juniorProbability
What is marginal probability?
Updated May 17, 2026
Short answer
Marginal probability is the probability of a single variable regardless of other variables.
Deep explanation
Marginal probability is obtained by summing or integrating joint probabilities over other variables. It represents the standalone probability of an event in a multivariate system.
Real-world example
Probability of a customer buying a product regardless of age group.
Common mistakes
- Confusing marginal probability with conditional probability.
Follow-up questions
- How is marginal probability computed?
- Why is it called marginal?