A mail-order house,advertising "same day" service,received a large number of complaints.A change in the handling of orders was made with less than 5 unfilled orders on hand (per picker)at the end of 95 out of every 100 working days.Frequent checks of unfilled orders at the end of the day revealed that the distribution of unfilled orders approximated a Poisson distribution;that is,most of the days there were no unfilled orders;some of the days there was one order,and so on.Since the average number of unfilled orders per picker was 2.0,the mail-order house lived up to its goal.

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The fact that there were less than 5 unfilled orders on hand at the end of 95 out of every 100 working days, and the distribution of unfilled orders approximated a Poisson distribution, suggests that the mail-order house was able to meet its goal of "same day" service with an average of 2.0 unfilled orders per picker.

A Mail-Order House,advertising "Same Day" Service,received a Large Number of Complaints.A