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To find the mean score, you need to add up all the numbers and then divide by the total count of numbers.
6 + 8 + 10 + 11 + 14 + 4 + 5 + 8 + 2 + 7 + 7 + 5 + 10 + 12 + 11 = 110
Now, divide by the total count of numbers:
110 / 15 = 7.33
Therefore, the mean score of the numbers of miles run is 7.33 miles.