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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 23% allowance for workers.a) Compute the standard time for the bag-packing task.
b) How many observations are necessary for 99% confidence, within 5% accuracy?
Observations (seconds) Performance
Element 1 2 3 4 5 Rating (%)
Grasp and place bag 8 9 8 11 7 110
Fill bag 36 41 39 35 112a 85
Seal bag 15 17 13 20 18 105
Place bag on conveyor 8 6 9 30b 35b 90
aBag breaks open; included as delay in the allowance factor. bConveyor jams; included as delay in the allowance factor
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