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.

## Answer this Question

## Related Questions

- Math - A bag of marbles contains only green and red marbles. All of the marbles ...
- math - A bag contains red, blue, and orange marbles. If the probability of ...
- Math - A bag contains nine red marbles, four green marbles, three blue marbles, ...
- math - You draw 2 marbles from a bag containing 3 blue marbles, 2 green marbles...
- Math - There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag. ...
- math - sally has a bag with red,blue, and green marbles. She has twice as many ...
- Math :) - In a bag of 10 marbles, there are 5 blue marbles, 3 red marbles, and 2...
- Math Probability - In a bag of 10 marbles, there are 5 blue marbles, 3 red ...
- Probability - a bag contains 9 red marbles and 4 blue marbles. how many clear ...
- math - A bag contains 7 blue marbles, 5 red marbles, and 9 green marbles. A ...

More Related Questions