The mean (or average) of 8, 9, and 10 is 9.
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-9,-11,-8,-12,-10
15
8, 9, 11 and 12
8 and 9/10 = 89/10
9;9;9 Mean = sum of scores / number of scores = 9+9+9 / 3 = 27 / 3 = 9 another example is 7, 9, 11 8, 9, 10 etc even: 7, 8, 12