30
To solve this problem, we need to calculate the probability of drawing a purple marble in one trial. There are 2 purple marbles out of a total of 30 marbles, so the probability is 2/30 = 1/15.
In 300 trials, we would expect to see 300 * (1/15) = 20 purple marbles. So Emerson should expect to see 20 purple marbles after 300 trials.
A bag contains 30 marbles, 3 of which are blue, 20 are red, 5 are green, and 2 are purple. Emerson takes a marble out of the bag, records the color, and returns it to the bag. How many purple marbles should he expect after 300 trials? (5 points)
20
30
50
200
1 answer