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%u2019s policy is a 23% allowance for workers.

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%u2019s 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?

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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%u2019s policy is a 23% allowance for workers.
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Element        Observations (seconds)    Performance Rating (%)
1     2     3    4        5

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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

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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