The question in the image is asking for the average (mean) of the numbers: 11, 0, 7, 13, and 9.

To find the average, you add all the numbers together and then divide by the count of the numbers:

$\text{Sum} = 11 + 0 + 7 + 13 + 9 = 40$

There are 5 numbers in total, so:

$\text{Average} = \frac{\text{Sum}}{\text{Count}} = \frac{40}{5} = 8$

So, the average is 8.

Would you like any more details, or do you have any questions?

Here are some related questions that might interest you:

1. How do you find the median of a set of numbers?
2. What is the difference between the mean, median, and mode?
3. How can outliers affect the average?
4. How do you calculate the weighted average?
5. What are some real-world applications of calculating averages?

Tip: When finding an average, ensure all values are correctly added and counted; even a small mistake can lead to an incorrect result.