Posted by **Anonymous** on Tuesday, July 17, 2012 at 3:38pm.

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 -
**Ms. Sue**, Tuesday, July 17, 2012 at 3:43pm
5/25 = 1/5

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

- conditional probability -
**MathMate**, Tuesday, July 17, 2012 at 10:10pm
P(R1)=5/11

P(R2)=5/25

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

P(R1∩R2)=P(R1)*P(R2)

P(R2|R1)=P(R2∩R1)/P(R1)

=P(R1)*P(R2)/P(R1)

=P(R2)

=1/5 as Ms.Sue had it.

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