How do you find the average of the numbers 10, 20, and 30?

To find the average of a set of numbers, you first add all the numbers together and then divide the total by the number of values in the set. In this case, you have the numbers 10, 20, and 30.

1. First, add the numbers together: 10 + 20 + 30 equals 60.

2. Then, divide this sum by the number of numbers in the set, which is 3: 60 divided by 3 equals 20.

This process correctly calculates the average, which is why the option indicating to add them together and divide by 3 is accurate. Using the correct method ensures that the average represents the central value of the given numbers in the dataset.