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To find the **average rate of change** in attendance from 2015 to 2019, we will use the formula for the average rate of change:

\[
\text{Average rate of change} = \frac{\text{Change in attendance}}{\text{Change in time (years)}}
\]

### Step-by-step:

1. **Initial attendance (2015)**: 17.26 million
2. **Final attendance (2019)**: 16.67 million
3. **Change in attendance**: 
\[
17.26 - 16.67 = 0.59 \text{ million}
\]
4. **Change in time**: 
\[
2019 - 2015 = 4 \text{ years}
\]
5. **Average rate of change**:
\[
\frac{0.59}{4} = 0.1475 \text{ million per year}
\]

Thus, the **average rate of change** in attendance from 2015 to 2019 is approximately **0.1475 million per year** (or 147,500 people per year).

Would you like further details or have any questions?

Here are 5 related questions to deepen your understanding:
1. How would you calculate the total change in attendance over multiple non-consecutive years?
2. What does a negative average rate of change represent in terms of attendance?
3. How can we use this average rate to predict attendance in future years?
4. What would the average rate of change be if the attendance had increased instead of decreased?
5. How does the rate of change between 2015 and 2017 compare to the rate between 2018 and 2019?

**Tip**: Average rate of change helps to measure trends over a period, but it's important to note whether the data fluctuates within that period.

Find the average rate of change in the attendance from 2015 to 2019. Give units.

This example demonstrates how to calculate the average rate of change in NFL attendance from 2015 to 2019. The problem focuses on key concepts such as the average rate of change, linear functions, and applying the formula to real-world data. Suitable for students in Grades 9-12.

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