Aircraft accidents?
in aircraft industry, level of quality must "zero defect".
comparison, 6 sigma level of quality means 3.4 defects per million products.
companies have gone beyond six-sigma, such ge aircraft engines, operate @ 9 sigma levels of quality.
e-table compairing actual accidents rates 1 given in table check flight safety records. table supposed give interval accident rate attributable probability , not other factor wrong maint practices or pilot errors.
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