Question: Joe studied his control chart and noticed it had been built with repeated samples of ten units and three-sigma limits that were UCL = 109.0125

Joe studied his control chart and noticed it had been built with repeated samples of ten units and three-sigma limits that were UCL = 109.0125 and LCL = 90.9875. What is the process standard deviation?

A)9.5

B)6.7

C)5.2

D)3


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