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Introduction to Probability

AP Statistics· difficulty 2/5

Events A and B have P(A) = 0.5, P(B) = 0.4, P(A and B) = 0.2.

A B A and B

What is P(A or B)?

  • A

    0.9

  • B

    0.7

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  • C

    0.2

  • D

    1.1

Explanation

P(A or B) = P(A) + P(B) - P(A and B) = 0.5 + 0.4 - 0.2 = 0.7.

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