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 size of a new radial tire.The $\overline { \mathrm { X } }$
And R charts are found to be in statistical control with $\overline { \overline { X } } = 50.25 , \bar { R } = .8$

Inches.A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed.Calculate the estimate of the percentage of tires that are out of specification.

A) 1.93%
B) 2.68%
C) 1.62%
D) 17.36%