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

Question 36

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, Σ\Sigma X = 15,350 and Σ\Sigma R = 411.4
To construct a range chart, what is the upper control limit (UCL) for the range?


A) 37.553
B) 411.4
C) 0.00
D) 102.85

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