Sarah Soliz, Director of Quality Programs, Is Designing $\bar { x }$

Sarah Soliz, Director of Quality Programs, is designing $\bar { x }$ and R charts for the rod shearing process at Stockton Steel.She has 26 samples of rod length, and each sample included measurements of 5 rods.The mean of the 26 sample means is 112 inches, and mean of the 26 ranges is 0.15 inch.The upper control limit for her $\bar { x }$ chart is ________.

A) 112.09
B) 5.087
C) 26.087
D) 115.90
E) 110.09

Correct Answer:

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