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To find the mean score, add all the values together and then divide by the total number of values.
6 + 4 + 5 + 6 + 7 + 8 + 12 + 9 + 10 + 11 + 5 + 8 + 7 + 4 + 10 = 112
There are a total of 15 values.
Mean = 112 / 15 = 7.47
Therefore, the mean score of the miles run is 7.47.