# GS-3 - OM 335 Bagchi Group Homework 3 Based on the case Six Sigma Quality at Flyrock Tires Names SOLUTION(The questions are designed to help Susan

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OM 335 Bagchi Names: SOLUTION Group Homework – 3 Based on the case: Six Sigma Quality at Flyrock Tires (The questions are designed to help Susan Douglas understand the current capability of the extrusion process and quantify the benefit that may be achieved if the extruder could be transformed to a Six Sigma process.) 1. If the extruder setting is accurate, what proportion of the rubber extruded will be within specifications? 2. Douglas has asked to take a sample of 10 sheets of rubber each hour from the extruder and measure the thickness of each sheet. Based on the average thickness of the sample, operators will decide whether the extrusion process is in control or not. Given that Douglas plans Three Sigma control limits, what upper and lower control limits should she specify to the operators? 3. If a bearing is worn out, the extruder produces a mean thickness of 403 thou when the setting is 400 thou. Under this condition, what proportion of defective sheets will the extruder produce? Assuming the control limits in question 2, what is the probability that a sample taken from the extruder with the worn bearings will be out of control? On average, how many hours are likely to go by before the worn bearing is detected? 4.

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## This note was uploaded on 04/20/2011 for the course OM 335 taught by Professor Jonnalagedda during the Spring '08 term at University of Texas at Austin.

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GS-3 - OM 335 Bagchi Group Homework 3 Based on the case Six Sigma Quality at Flyrock Tires Names SOLUTION(The questions are designed to help Susan

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