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Common Core For Grade 7
Examples, videos, and solutions to help Grade 7 students learn how to estimate probabilities by collecting data on an outcome of a chance experiment.
Lesson 2 Classwork
Example 1: Carnival Game
At the school carnival, there is a game in which students spin a large spinner. The spinner has four equal sections numbered 1–4 as shown below. To play the game, a student spins the spinner twice and adds the two numbers that the spinner lands on. If the sum is greater than or equal to , the student wins a prize.
Exercises 1–8
You and your partner will play this game 15 times. Record the outcome of each spin in the table below.
Example 2
A student brought a very large jar of animal crackers to share with students in class. Rather than count and sort all the different types of crackers, the student randomly chose 20 crackers and found the following counts for the different types of animal crackers.
The student can now use that data to find an estimate for the probability of choosing a zebra from the jar by dividing the observed number of zebras by the total number of crackers selected.
Exercises 9–15
If a student were to randomly select a cracker from the large jar:
9. What is your estimate for the probability of selecting a lion?
10. What is the estimate for the probability of selecting a monkey?
11. What is the estimate for the probability of selecting a penguin or a camel?
12. What is the estimate for the probability of selecting a rabbit?
13. Is there the same number of each animal cracker in the large jar? Explain your answer.
14. If the student were to randomly select another 20 animal crackers, would the same results occur? Why or why not?
15. If there are animal crackers in the jar, how many elephants are in the jar? Explain your answer.
Sample Questions
Example 1: Carnival Game
At the school carnival, there is a game in which students spin a large spinner. The spinner has four equal sections numbered 1–4 as shown below. To play the game, a student spins the spinner twice and adds the two numbers that the spinner lands on. If the sum is greater than or equal to , the student wins a prize.
Exercises 1–8
You and your partner will play this game 15 times. Record the outcome of each spin in the table below.
A student played a game using one of the spinners below. The table shows the results of spins. Which spinner did the student use? Give a reason for your answer.
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