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6 May, 20:10

A and B are two events.

Let P (A) = 0.5, P (B) = 0.25, and P (A and B) = 0.15.

Which statement is true?

A and B are not independent events because P (A|B) ≠P (A).

A and B are not independent events because P (A|B) = P (A) and P (B|A) = P (B).

A and B are independent events because P (A|B) = P (B) and P (B|A) = P (A).

A and B are not independent events because P (A|B) = P (B) and P (B|A) = P (A).

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Answers (1)
  1. 6 May, 20:38
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    A and B are not independent events because P (A|B) ≠P (A)

    is the correct answer.

    Step-by-step explanation:

    If A and B are independent then we must have

    P (AB) = P (A) P (B) and also

    P (A/B) = P (A)

    We are given that

    A and B are two events.

    Let P (A) = 0.5, P (B) = 0.25, and P (A and B) = 0.15.

    P (A/B) = P (AB) / P (B) = 0.15/0.5 = 0.3

    i. e. P (A/B) is not equal P (A)

    Similarly P (B/A) = P (AB) / P (A) = 0.15/0.25 = 0.6 not equal to P (B)

    Hence A and B are not independent.
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