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The question asks for a description of the complement of the given event: 

- The event is that "When 10 adults are tested for high blood pressure, at least one of the results is positive."

To find the complement of this event, we need to describe the situation where the original event **does not happen**. The original event is that at least one person has high blood pressure, so its complement is:

- **None of the 10 adults have high blood pressure.**

This means that all 10 adults test negative for high blood pressure.

Would you like more details or have any questions? Here are some related questions:

1. What is the definition of "complement" in probability theory?
2. How do we calculate the probability of the complement of an event?
3. What is the probability of all 10 adults not having high blood pressure, if the probability of each having high blood pressure is known?
4. How would this problem change if the number of adults tested were different?
5. How can we use the complement rule to solve problems involving multiple test results?

**Tip:** In probability, the complement of an event is often helpful when calculating the probability of something **not** happening, as the sum of the probabilities of an event and its complement always equals 1.

When 10 adults are tested for high blood pressure, at least one of the results are positive.

Explore the probability of a complementary event by testing 10 adults for high blood pressure. This problem demonstrates the complement rule and explains how none of the adults having high blood pressure is the complement of at least one person having it. Suitable for Grades 8-10.

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