Final answer:
To find the average of three test scores, add up the scores and then divide the sum by 3.
Step-by-step explanation:
To find the average of three test scores, you need to add up the scores and then divide the sum by 3.
Here is an example:
Let's say the three test scores are 85, 90, and 92.
Add the scores: 85 + 90 + 92 = 267
Divide the sum by 3: 267 / 3 = 89
So, the average of the three test scores is 89.