Control charts on x and R for samples of size n- 5 are to be maintained on
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(a) Compute the center line and control limits for the x and R control charts.
(b) Suppose both charts exhibit control. There is a single lower specification limit of 16 lb. If strength is normally distributed, what fraction of yarn would fail to meet specifications?
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Related Book For 
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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