Question: 2. (17 pt) A precision machine producing ball bearings is supposed to produce perfect spheres with a diameter of 199 m (micrometers). After measuring a
2. (17 pt) A precision machine producing ball bearings is supposed to produce perfect spheres with a diameter of 199 m (micrometers). After measuring a sufficiently big number of ball bearings it was discovered that the machines mean produced diameter is 198 m with = 0.4 m. The specification limits are symmetric around the machines mean.
Round intermediate and final results to two decimals if needed.
- (6 pt) What should the specification limits be if the process were barely capable with Cpk = 1?
- (6 pt) After some time the machine wore out and the new standard deviation is = 1 m. With the original specifications limits found in (a), what is the total percentage of bad quality?
- (5 pt) Draw a graph showing the process distribution and all parameters and results of interest for this problem for the situation in (b).
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