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At what sigma level is this process operating?

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The Wall Street Journal reported on February 15, 2000, that about 750,000 airplane components are manufactured, machined, or assembled for Boeing Co. by workers from the Seattle Lighthouse for the Blind. A Boeing spokeswoman noted that the parts have an "exceptionally low" rejection rate of 1 per 1,000. At what sigma level is this process operating?

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The Solution provides the sigma level at which the process operating.

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Rejection rate if 1 per 1000 means 1/1000 = 0.001

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