Education Technology

Statistics and Probability / Unequally Likely Outcomes

Grade Level 7
Activity 14 of 24
In this lesson, students investigate chance processes and generate probability models for events that are not equally likely.

Planning and Resources

Students should recognize a chance event in which the outcomes are not equally likely and find the probabilities of those outcomes.

equally likely

Standard: Search Standards Alignment


Lesson Snapshot


Students recognize the difference between outcomes of a chance event that are equally likely and those that are not.

What to look for

By the end of this lesson, students should be able to use their experimental results and the theoretical probabilities to explain why the events in a chance process are or are not equally likely.

Sample Assessment

Are the outcomes in the spinner equally likely? Why or why not?

No, because the probability of getting each color is not the same: the probability of getting a red is (3/6), blue is (2/6) and green is (1/6).

The Big Idea

Not all outcomes of a chance event are equally likely.

What are the students doing?

Students experience setting up a model, using a simulation to collect data and estimate probabilities for a real situation in which the outcomes are not equally likely.

What is the teacher doing?

You may need to refer to Activity 13 in this series to refresh students on determining the probability of a compound event.