Answer: 0.053
Explanation:
n(r) = 7
n(b) = 8
n ( g) = 5
Total number of marbles = 20
The probability that both marbles drawn will be green will be
The probability of the first being green = 5/20 and the probability that the second marble is green = 4/19.
We will multiply the two together , we have
5/20 x 4/19 = 20/380 = 0.05263157895
Therefore : the probability, to the nearest 10th of a percent, that both marbles drawn will be green will be 0.053