A manufacturer produces pencils. The average defect rate is known to be 0.028. T

Question

A manufacturer produces pencils. The average defect rate is known to be 0.028. This production process is assumed to be in control if the defect rate is within three standard deviations of the mean. Samples are taken of 200 pencils each. What b the upper control limit for this process? 0.112 0.084 0.0787 0.063 0.0597 A customer attempts to return a product after the warranty expiration. Checking the purchase date to prevent such returns would be a(n) activity. logistic filtering nullifying blocking gatekeeping none of the above The following two questions use the activity-on-arrow diagram below. What is the project completion time? 19 days 18 days 17 days 16 days 15 days What is the slack for task G? zero days one day two days three days four days

Explanation / Answer

Answer:

1. The correct answer is 0.063 because for this defect rate the satndard deviation [(0.063 - 0.028)2 / 200]1/2 comes under 3 points. for all values above this the standard deviation comes above 3 points. The correct answer is Option D.

2. Checking the purchase date to prevent such returns would be a Logistic Filtering Activity. The Correct answer is Option A.

3. The Longest time is the Project Completion Time. In the given question the longest time is 19 days (A-C-F-H-I). Hence, the project completion time is 19 days. The correct answer is Option A.

4. The slack for a task is the acceptable delay in completing the task without delaying the overall project completion time. For task G the slack time is 3 days (the task G start time is 7 days and its completion time is 12 days but the latest start time for task I is 15 days, therefore the task G can be delayed by 3 days). The correct answer is Option D.

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