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Conditional Probability

AP Statistics· difficulty 4/5

Same setup. A red marble was drawn.

0.5 Bag1 0.5 Bag2 R 0.6 B 0.4 R 0.3 B 0.7

What is the probability it came from Bag 1?

  • A

    1/2

  • B

    2/3

    check_circle
  • C

    3/5

  • D

    1/3

Explanation

P(Bag1|R) = 0.30/0.45 = 2/3.

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