The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data

Question

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? b) How many observations are necessary for 99% confidence, within 5% accuracy? Observations (seconds) Element 1 2 3 4 5 Performance Rating % Grasp and place bag 8 9 8 11 7 110 Fill bag 36 41 39 35 112 85 Seal bag 15 17 13 20 18 105 Place bag on conveyor 8 6 9 30 35 90

Explanation / Answer

Element Performance Rating( % ) Observations 1 2 3 4 5 ___________________________________________________________________________________________ Grasp and place bag 110 8 9 8 11 7 Fill bag 85 36 41 39 35 112a seal bag 105 15 17 13 20 18 place bag on conveyor 90 8 6 9 30b 35b a- bag breaks open; included as delay in the allowance factor b- conveyor jams; included as delay in the allowance factor.

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