A bag holds 2 yellow, 1 green, and 2 red marbles. If you were to draw a marble from the bag 150 times, and replace it after each draw, how many yellow marbles would you expect to draw?
A. 50
B. 60
C. 30
D. 120
The probability of drawing a yellow marble from the bag is 2/5. If you draw from the bag 150 times with replacement, the expected number of yellow marbles you would get is:
Expected value = probability of yellow marble x number of draws
Expected value = (2/5) x 150
Expected value = 60
Therefore, the answer is B. You would expect to draw 60 yellow marbles.