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-91 - (+76) = -91 - 76 = -167
91 - 16 = 75
91 - 63 = 28
86 is the mean of 85, 91, 76, 85, and 93.
82.
To find the average, add the scores and divide the sum by how many scores you are adding: 81 + 76 + 91 + 73 + 79 = 400 ÷ 5 = 80.