Margo has 3 blue marbles, 4 green marbles,and 5 red marbles in a bag. She randomly selects one marble. What is the probability t
hat the marble is green or red?
2 answers:
Prob(green) = number of green marbles / total number of marbles = 4/12 = 1/3
Prob(red) = 5/12
Here we add probabilities so the answer is 1/3 + 5/12 = 9/12 = 3/4
answer is 3/4 or 75%
First you must add up all the marbles in the bag.
3 blue marbles
4 green marbles
5 red marbles
3 + 4 + 5 = 12
You are looking for the probability of picking up either a green or red marble.
So not counting blue marbles, there are 9 green and red.
9/12 = 0.75
The probability of picking up either a green or red marble is 75%.
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