For a Manufacturing Process $\overline { \overline X }$ = 10 Inches

Multiple Choice

For a manufacturing process, $\overline { \overline X }$
= 10 inches, $\overline { \mathrm { R } }$
= ) 4 inches,and the subgroup sample size is 6 units.Calculate the standard control limits for the $\bar { X }$
Chart.

A) 9.526 and 10.474
B) 9.769 and 10.231
C) 9.807 and 10.193
D) 9.484 and 10.516
E) 8.80 and 11.20