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A Company Is Producing Cylindrical Blocks for a Children's Toy

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A company is producing cylindrical blocks for a children's toy.The average diameter of a block is 3.5 inches.Sixteen blocks are inspected and the diameters are measured.The standard deviation is estimated to be 0.02 inches.What are the 99.7% upper and lower control limits for the x-bar chart?

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LCL = 3.48...

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