The data set is: 40, 15, 17, 47, 71, 81, 12, 61, 57, 68.
There are 10 data points.
Sum of data points = 40 + 15 + 17 + 47 + 71 + 81 + 12 + 61 + 57 + 68 = 470
Mean = $\frac{\text{Sum of data points}}{\text{Number of data points}} = \frac{470}{10} = 47$
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