Question

Help please!!! 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?

A) 80
B) 100
C) 120
D) 200

Answer 1

A

Explanation:

We would need to multiply the number of trials (which is 500) by the probability of choosing a red in 1 try from the information given.

There are 50 in total, and 8 of them are red, so:

P(red) =
`(8)/(50)=0.16`

Now we multiply this with 500 to get:

`500*0.16=80`

The correct answer is A.

Answer 2

Marcie should expect 80 red marbles. Correct answer is (A).

Explanation:

First we need to calculate the probability of red marble to come from the bag of 50 marbles.

P=
`(Favourable condition)/(Total condition)`

P=8/50

Now the chances of getting red marble after 500 trail is calcualted as

x=P*500

=(8/50)*500

=80

Therefore the correct answer is (A).