Sarah Soliz,Director of Quality Programs,is Designing and R Charts

Multiple Choice

Sarah Soliz,Director of Quality Programs,is designing 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 R chart is ____.

A) 0.150
B) 10.57
C) 0.317
D) 2.114
E) 0.713