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? (5 points)
80

100

120

200
I got 80.

Answer 1

You need to work out what fraction of the 50 are red 8\50 are red
Find out how many times 50 goes in 500                                                                  500 divided by 50 = 10                                                                                                 Multiply by 8 to get the total number of red
8x10 = 80 red marbles

Answer 2

50 total marbles

chance of getting a red marble is 8/50

8/50 = 80/500

Answer is 80