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Conditional Probability

AP Statistics· difficulty 3/5

Definition of conditional probability.

A B A ∩ B P(A|B) = ?

P(A | B) equals:

  • A

    P(A) * P(B)

  • B

    P(A and B) / P(B)

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  • C

    P(A) / P(B)

  • D

    P(A) + P(B)

Explanation

By definition, P(A|B) = P(A and B)/P(B).

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