You have a bag of marbles with 3 red marbles, 2 black marbles, 6 green marbles, and 4 blue marbles. If you reach into the bag without looking, what is the probability of pulling out a red marble?
There are a total of 15 marbles in the bag. The probability of pulling out a red marble is the number of red marbles divided by the total number of marbles:
3/15
Simplifying the fraction, we get:
1/5
Therefore, the probability of pulling out a red marble is 1/5 or 0.2, which is equivalent to 20%.