Calculate the Average: Finding Mean of 11, 13, 4, and 9

To solve this problem, we'll follow these steps:

• Step 1: Calculate the sum of the numbers.
• Step 2: Divide the sum by the number of values to find the average.

Now, let's work through each step:
Step 1: The numbers given are 11, 13, 4, and 9. We calculate the sum as follows:
$11 + 13 + 4 + 9 = 37$.
Step 2: To find the average, divide the sum by 4 (the number of values):
$\frac{37}{4} = 9.25$ or $9\frac{1}{4}$ when expressed as a mixed number.

Therefore, the average of 11, 13, 4, and 9 is $9\frac{1}{4}$.