Machine Oil Is Used by Clothing Manufacturers to Lubricate and Protect

question 9

Multiple Choice

Machine oil is used by clothing manufacturers to lubricate and protect sewing machines. A company that produces machine oil must ensure that the viscosity of its product meets customer requirements. Consequently, the viscosity of every batch of oil produced is measured. Suppose that the process mean is 101 cP and the process standard deviation is 1.50 cP. What are the limits for a runs chart to be used to see that the process remains control?

• A) 99.5 cP and 102.5 cP
• B) 96.5 cP and 105.5 cP
• C) 95.5 cP and 106.5 cP
• D) 92.5 cP and 110.5 cP
• E) 99.5 cP and 107.5 cP

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