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 proceeding with further calculations.
Performance
Observation (seconds)
Element
Rating
1
2
3
4
5
Grasp and place bag
115
%
8
10
8
11
7
Fill bag
85
%
36
40
40
34
110
*
Seal bag
110
%
15
17
14
20
17
Place bag on conveyor
85
%
9
5
8
31
^
36
^
* 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?
1 answer
The way you have given the data makes it extremely difficult to impossible to answer your question.