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 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

Hi,

Please find the answer as follows:

Part A:

Step 2: Normal time for Each Activity

Normal Time = 65.88

Average Variance = 14.9

Standard Deviation = (14.9)^.5 = 3.86

Allowance Factor = .23

Standard Time = Normal Time/(1- Allowance Factor) = 65.88/(1-.23) = 85.56 seconds.

Part B:

h = .05

Number of Samples = 8

Thanks.

Step1: Find average observation time for each activity Activity Average time(seconds) Grasp and place bag 8.60 Fill bag 37.75 Seal bag 16.60 Place bag on conveyer 7.67

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