A bag contains 3 red marbles, 7 blue marbles, and 2 green marbles. What is the probability of choosing a blue marble when one marble is drawn?

7/12

Step-by-step explanation:

To find the probability of drawing a blue marble you need to find how many marbles there are in total.

So you have to add 3 red marbles, 7 blue marbles, and 2 green marbles to get the total.

So 3 + 7 + 2 = 12

There are 12 marbles in total so now you have to find how many blue marbles there are.

There are 7 blue marbles out of 12 marbles.

Now you have to put this as a fraction to see if it can be simplified.

7/12 cant be simplified, so the probability of drawing a blue marble is 7/12.