An efficiency study was done on the delivery of first-class mail originating from the four cities listed

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An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in that same city. Samples were taken on two occasions, Sept. 1, 2010 and Sept. 1, 2014.

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