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NS Iron Products (NSIP) supplies 5-inch diameter iron pipes to its customers, Their productor process is such that the average diameter (U) is 5 inches with a standard denation () of 08 inches. The Quality Assurance Department takes a random sample of 64 pipes and calpulgies the average diameter of these pipes. Whenever the sample average falls below 4 77 inches or goes above 5.23, an immediate root cause analysis investigation is initiated 1. Approximately what fraction of the root cause analysis investigations, even if each investigation is correct and thorough, will not result in the detection of any systematic cause for deviation