Step-by-step explanation: Probability is the likelihood or chance that an event will occur. Probability = Expected outcome of event/ Total outcome If a bag contains 3 red marbles, 7 blue marbles and 5 green marbles, the total number of marbles in the bag will be the total outcome i.e 3+7+5 = 15 If two blue marbles are drawn, the expected outcome in both cases is 7 since there are 7 blue marbles in the bag. Probability of drawing the first blue marble = 7/15 Probability of drawing the second blue marble = 7/15 Probability that both marbles drawn will be blue = 7/15*7/15 = 49/225 = 0.218 (to nearest 1000th)
