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To find the range of the set of weights of the 9 cats from the box plot, we need to determine the difference between the maximum and minimum values on the number line.

From the box plot:

- The minimum value (leftmost point of the whisker) appears to be **9**.
- The maximum value (rightmost point of the whisker) appears to be **20**.

The range is calculated as:
\[
\text{Range} = \text{Maximum} - \text{Minimum} = 20 - 9 = 11
\]

Thus, the correct answer is:
- **C. 11**

Would you like more details or have any questions?

Here are 5 related questions to expand on this:
1. What is the interquartile range (IQR) and how can it be found from a box plot?
2. How does the range differ from the IQR when analyzing data?
3. Can outliers affect the range of a dataset, and how?
4. What are some advantages and disadvantages of using the range as a measure of spread?
5. How do you calculate the variance and standard deviation for a dataset?

**Tip:** Always check both the maximum and minimum values in the dataset to ensure the range is accurate when using a box plot.

The weights of 9 different cats, in pounds, were used to create the box plot above. Which of the numbers below is the range of the set of weights?

Learn how to calculate the range from a box plot using the weights of 9 different cats in pounds. Understand the difference between maximum and minimum values to determine the range of the data set. Suitable for students in Grades 6-8.

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