Probability Word Problem

In this lesson you will learn how to solve a probability word problem. Double-click the play button to start the video.

Without looking, Tom draws a marble from a bag containing 12 marbles. There are 3 red marbles, 4 blue marbles, and 5 green marbles. What is the probability that he will draw a blue marble?

When solving probability problems, remember this important formula:

P(event)= Number of favorable outcomes / Total number of outcomes

In the above problem, the number of favorable outcomes is 4 because there are $ blue marbles in the bag. The total number of outcomes is 12 because there are 12 different marbles in the bag.

A probability can be written as a fraction, a decimal, or a percent. If you choose to write the answer as a fraction, remember to simplify the fraction.

Click on this picture to play an online game about probabilities.

Test your knowledge about this topic by taking an online quiz.

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