Random Samples of Four Items Are Selected from a Manufacturing

question 56

Multiple Choice

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples,ΣX = 15,350 and ΣR = 411.4. To construct a mean chart,what is the upper control limit for the mean?

• A)614.00
• B)411.4
• C)626.00
• D)3837.5

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