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Random Samples of Four Items Are Selected from a Manufacturing

Question 84

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 (UCL) for the mean?


A) 614.00
B) 411.4
C) 625.996
D) 3837.5

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