juniorProbability
What is joint probability?
Updated May 17, 2026
Short answer
Joint probability is the probability of two events occurring together.
Deep explanation
Joint probability P(A ∩ B) measures the likelihood that both events A and B happen simultaneously. It is fundamental for understanding dependence and conditional probability.
Real-world example
Probability that it rains and there is traffic congestion.
Common mistakes
- Assuming joint probability equals product without checking independence.
Follow-up questions
- How is joint probability related to conditional probability?
- What is joint distribution?