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

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

anonymous · Answer

A ?

anonymous · Answer

well.i would do it cuz i subtracted 50 minus everything ...so yea i would go with tht :)

anonymous · Answer

OKay thank you

welshfella · Answer

probability of drawing a red marble on one draw = 8/50 = 4/25

welshfella · Answer

expected number of reds for 500 trials = 4/25 * 500 =  4*20 = 80