Random Samples of 4 Items Are Selected from a Manufacturing $\Sigma$

question 118

Multiple Choice

Random samples of 4 items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, $\Sigma$ X = 15,350 and $\Sigma$ R = 411.4
To construct a mean chart, what is the lower control limit (LCL) for the mean?

• A) 602.004
• B) 411.400
• C) 625.666
• D) 0.00

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