What is the mean test score: 85, 83, 91, 93, 72, 85, 76, 80, 82, 89
The mean test score is calculated by adding all the scores together and then dividing by the number of scores given.
85 + 83 + 91 + 93 + 72 + 85 + 76 + 80 + 82 + 89 = 846
846 / 10 = 84.6
Therefore, the mean test score is 84.6.