Final answer:
To find the average (mean) of the given test scores, add up all the numbers and then divide the sum by the total number of scores. The average test score is 76.
Step-by-step explanation:
To find the average (mean) of the given test scores, you add up all the numbers and then divide the sum by the total number of scores. In this case, the test scores are 83, 92, 47, 78, and 80.
Adding up these scores, we get 83 + 92 + 47 + 78 + 80 = 380.
Dividing the sum by the total number of scores, which is 5 in this case, we get 380 ÷ 5 = 76.
Therefore, the average test score is 76.