Calculating Probability of Picking a Blue Marble

Jasmine has a bag of colored marbles. The bag contains 3 red marbles, 5 blue marbles, and 2 green marbles. If Jasmine randomly picks one marble from the bag, what is the probability that she picks a blue marble?

To calculate the probability of an event occurring, use the formula:

$P(E) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$