Random Samples of Four Items Are Selected from a Manufacturing

question 43

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 LCL for the mean?

• A)602.00
• B)411.40
• C)625.67
• D)0.00

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