AP®︎ Statistics (pre-2026): Topic 4.4 Flashcards

Master key terms and definitions for Topic 4.4 of AP Statistics (pre-2026) – Mutually Exclusive Events to help you prep for quizzes and the AP exam.

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Term

Intersection / Joint Probability

Definition

The probability that both events occur, written as P(A ∩ B) or P(A and B).

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Intersection / Joint Probability
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The probability that both events occur, written as P(A ∩ B) or P(A and B).

VAR-4.CVAR-4.C.1
Addition Rule for Mutually Exclusive Events
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For disjoint events, P(A ∪ B) = P(A) + P(B) because there is no overlap.

VAR-4.CVAR-4.C.2
Mutually Exclusive vs. Independent Events
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Disjoint events cannot occur together; independent events do not affect each other's probabilities.

VAR-4.CVAR-4.C.2
Mutually Exclusive / Disjoint Events
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Events with no outcomes in common, so their intersection has probability 0.

VAR-4.CVAR-4.C.2
Union
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The probability that at least one of two events occurs, written as P(A ∪ B).

VAR-4.C