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The mean number of trees planted each day is calculated by adding up all the numbers of trees planted and dividing by the total number of days.
Adding up all the number of trees planted:
39 + 29 + 21 + 39 + 25 + 17 + 21 + 29 + 37 + 14 = 271
Dividing by the total number of days:
271 / 10 = 27.1
Rounding to the nearest whole number, the mean number of trees planted each day is 27.