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The question asks about the impact of Billy's score being included in the class average. 

- The current class average is **82%**, and Billy scored **70%** on the test. 
- Since Billy's score (70%) is lower than the current class average (82%), including his score will **lower** the overall class average.

Thus, the correct answer is:
- **C. The class average will go down.**

Would you like further explanation on class averages or the impact of individual scores? Here are five related questions:

1. How do you calculate the new class average after adding Billy's score?
2. How is a class average calculated in general?
3. What happens to the average if a new score is higher than the current average?
4. Can including more students with below-average scores lower the average further?
5. What would the effect be if Billy's score was higher than 82%?

**Tip:** To find the new average, sum up all the individual scores, including the new one, and divide by the total number of students.

Mrs. Jenkins just finished grading her math tests. The class average score on her test was 82%. However, she forgot to grade Billy's paper. Billy scored 70% on the test. What is going to happen to the class average once she includes Billy's score?

Explore how adding Billy's score of 70%, lower than the class average of 82%, will affect the overall class average. This problem teaches concepts of averages and how new data influences the overall result. Suitable for Grades 6-8.

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