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conditional probability

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You have two bags of marbles.

Bag 1 has 5 red and 6 blue marbles.
Bag 2 has 20 green and 5 red marbles.

What is the probability of drawing a red marble out of Bag 2, given that you drew a red marble out of Bag 1?

  • conditional probability - ,

    5/25 = 1/5

    It makes no difference what color she drew from Bag 1.

  • conditional probability - ,


    Since the drawing of the two bags are independent, we have

    =1/5 as Ms.Sue had it.

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