The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data
ID: 403746 • Letter: T
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 necessay for 99% confidence, within 5% accuracy?
Observations (seconds) - Element - 1,2,3,4,5, Grasp and place bag-8,9,8,11,7 Fill bag- 36,41,39,35,112a Seal bag- 15,17,13,20,18 Place bag on conveyor- 8,6,9,30b,35b. Performance Rating (%). * a- bag breaks open; included as delay in the allowance factor. *b- Conveyor jams; included as delay in the allowance factor.
Explanation / Answer
Element 1
8+,9+,8,+11+,7= 43/5
8.6 seconds
Element 2
36,+41+,39+,35+,112=151/4
37.75 seconds
Element 3
15,+17+,13+,20+,18=83 /5
16.6 seconds
Element 4
8+,6+,9,=23/3
7.67 seconds
Normal time
Normal time x performance rating
Element 1
8.6 seconds x 1.10
9.46 seconds
Element 2
37.75 secondsx0.85
32.09 seconds
Element 3
16.6 secondsx 1.05
17.43 seconds
Element 4
7.67 seconds x0.90
6.90 seconds
Noram time for process=
65.88 seconds
Standard time = 65.88 seconds / 1- 0.23=85.56 seconds
Job element
mean
h
Std dev
Std dev of sample
Sample require
drasp
8.6 seconds
0.05
2.58
1.52
83
Fill bag
37.75 seconds
0.05
2.58
2.75
14
Seal bag
16.6 seconds
0.05
2.58
2.70
70
Place bag
7.67 seconds
0.05
2.58
1.54
107
Element 1
8+,9+,8,+11+,7= 43/5
8.6 seconds
Element 2
36,+41+,39+,35+,112=151/4
37.75 seconds
Element 3
15,+17+,13+,20+,18=83 /5
16.6 seconds
Element 4
8+,6+,9,=23/3
7.67 seconds
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