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

question 116

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 value for the center line?

• A) 15,350
• B) 614
• C) 411.4
• D) 3837.5

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