Final answer:
The probability of drawing a red marble out of the bag without looking is 1/3.
Step-by-step explanation:
The probability of drawing a red marble out of the bag without looking can be calculated by dividing the number of red marbles by the total number of marbles in the bag. In this case, there are 3 red marbles out of a total of 9 marbles, so the probability is 3/9, which simplifies to 1/3.