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A manufacturing process produces stainless steel pipe . The average number of surface cracks per foot of pipe is known to be 21 . a
A manufacturing process produces stainless steel pipe . The average number of surface cracks per foot of pipe is known to be 21 . a ) Suppose the manufacturer considers the upper control limit to be three standard deviations above the mean . How many surface cracks per foot of pipe would that b ) Suppose the manufacturer considers the lower control limit to be three standard deviations below the mean . How many surface cracks per foot of pipe would that be?
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