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To find the mean score, you need to add up all the numbers and then divide by the total number of numbers. Here's the calculation:
(15 + 21 + 32 + 42 + 29 + 57 + 39) / 7 = 235 / 7 = 33.57
Therefore, the mean score of the numbers 15, 21, 32, 42, 29, 57, and 39 is 33.57.