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Practical Management Science
6th Edition
ISBN: 9781337406659
Author: WINSTON, Wayne L.
Publisher: Cengage,
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
Transcribed Image Text:The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high
physical demands of the job, the company's policy is a 25% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with
further calculations.)
Element
Grasp and place bag
Fill bag
Seal bag
Place bag on conveyor
*
Performance
Rating
105%
85%
110%
90%
1
8
35
14
9
Observation (seconds)
2
8
41
16
5
Bag breaks open; included as delay in the allowance factor
^ Conveyor jams; included as delay in the allowance factor
a) The standard time for this process = 87.5 seconds (round your response to two decimal places).
b) The number of observations that are required for a 99% confidence level within 5% accuracy =
3
9
39
12
10
4
10
35
20
30^
5
7
114*
19
35^
observations (round your response up to the next whole number).
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