A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If one marble is chosen randomly from the bag, what is the probability that it is a blue marble?

✓ Correct Answer: Option B

The total number of marbles in the bag is 5 + 3 + 2 = 10. There are 3 blue marbles. The probability of choosing a blue marble is the number of blue marbles divided by the total number of marbles, which is 3/10.