## anonymous one year ago A bag contains 50 marbles, 10 of which are blue, 8 are red, 20 are green, and 12 are purple. Marcie takes a marble out of the bag, records the color, and returns it to the bag. How many red marbles should she expect after 500 trials? 80 100 120 200

1. anonymous

@TheSmartOne

2. AbdullahM

Welcome to Openstudy! @liana1026 So what is the probability that we can select 1 red marble?

3. anonymous

100?

4. AbdullahM

No, it should be a fraction. $$\sf\large Probability ~of~ picking~ a ~red~ marble = \frac{Number~of~Red~marbles}{Number~of~total~marbles}$$

5. anonymous

Okay so 8 red and there are 50 total

6. anonymous

i dont understand proabablitly

7. AbdullahM

ok we have that as: $$\sf\Large \frac{8}{50}$$ Multiply that by 500

8. AbdullahM

8/50 is the probability of getting 1 red marble. So to find out for 500 marbles, we have to multiply by 500.

9. anonymous

80 ???

10. AbdullahM

correct :D

11. anonymous

Thank u sooo much