Suppose That $\overline { \mathrm { X } }$ And R Charts Based on Subgroups of Size 4 Are

Multiple Choice

Suppose that $\overline { \mathrm { X } }$
And R charts based on subgroups of size 4 are being used to monitor the tire diameter of a new radial tire.The $\overline { \mathrm { X } }$
And R charts are found to be in statistical control,with $\overline { \overline { X } } = 50.5 , \bar { R } = 1.25$

Inches.A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed.Compute the natural tolerance limits for this process.

A) [48.68,52.32]
B) [49.89,51.11]
C) [48.86,52.14]
D) [46.75,54.25]