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
25%
allowance for workers. (Round all intermediate calculations to two decimal places before procering
with further calculations.)
%
Performance Observation (seconds)
Element
Rating
2145
Grasp and place bag 115
%
10 8117
Fill bag
85
%
36 40 40 B41104
Seal bag
110
15 17 14 2017
Place bag on conveyor85
915 831 436
31 A36A
* 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 =
nothing
seconds (round your response to two decimal places).
b) How many observations are necessary for 99% confidence, within 5% accuracy?​

Answer 1

Answer:

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?

Element Observations (seconds) Performance Rating (%)

1 2 3 4 5

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.