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The mean delivery time for pizza shop one is calculated by adding up all the individual delivery times and then dividing by the number of data points.
Mean = (18 + 23 + 15 + 22 + 21 + 24 + 28 + 20) / 8
Mean = 171 / 8
Mean = 21.375
Therefore, the mean delivery time for pizza shop one is 21.375 minutes.