Question

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

Answer 1

@TheSmartOne

Answer 2

Welcome to Openstudy! @liana1026

So what is the probability that we can select 1 red marble?

Answer 3

100?

Answer 4

No, it should be a fraction.

\(\sf\large Probability ~of~ picking~ a ~red~ marble = \frac{Number~of~Red~marbles}{Number~of~total~marbles}\)

Answer 5

Okay so 8 red and there are 50 total

Answer 6

i dont understand proabablitly

Answer 7

ok we have that as:

\(\sf\Large \frac{8}{50}\)

Multiply that by 500

Answer 8

8/50 is the probability of getting 1 red marble.

So to find out for 500 marbles, we have to multiply by 500.

Answer 9

80
???

Answer 10

correct :D

Answer 11

Thank u sooo much