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4_Many manufacturing problems
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Many manufacturing problems involve the matching of machine parts, such as shafts that fit into a valve hole.  A particular design requires a shaft with a diameter of 22.000 mm, but shafts with diameters between 21.990 mm and 22.010 mm are acceptable.  Suppose that the manufacturing process yields shafts with diameters normally distributed, with a mean of 22.002 mm and a standard deviation of 0.005 mm.  For this process what is?

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