Final answer:
The arithmetic mean of -16, -9, and 4 is -7.
Step-by-step explanation:
To find the arithmetic mean, or average, of a set of numbers, you need to sum all the numbers and then divide the sum by the total number of values. In this case, the set of numbers is -16, -9, and 4. Step 1: Add -16, -9, and 4 together to get -21. Step 2: Divide -21 by 3 (the total number of values) to get -7. Therefore, the arithmetic mean of -16, -9, and 4 is -7.