Delivery of first-class mail originating

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Reference no: EM13993021

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. 1,2001 and Sept. 1, 2004.


Sept 1, 2001

Sept. 1, 2004













Reference no: EM13993021

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