Solved Problem 4

The Northville Post Office experiences a seasonal pattern of daily mail volume every week. The following data for two representative weeks are expressed in thousands of pieces of mail:

Day

Week 1

Week 2

Sunday

  5

  8

Monday

20

15

Tuesday

30

32

Wednesday

35

30

Thursday

49

45

Friday

70

70

Saturday

15

10

Total

224  

210  

  1. Calculate a seasonal factor for each day of the week.

  2. If the postmaster estimates 230,000 pieces of mail to be sorted next week, forecast the volume for each day of the week.

Solution

  1. Calculate the average daily mail volume for each week. Then, for each day of the week, divide the mail volume by the week’s average to get the seasonal factor. Finally, for each day, add the two seasonal factors ...

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