Suppose that and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company.The and R charts are found to be in statistical control with inches.A histogram of the tire diameter measurements indicates that distribution of these measurements is 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%

Question

Suppose that  and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company.The  and R charts are found to be in statistical control with  inches.A histogram of the tire diameter measurements indicates that distribution of these measurements is 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%

Quizplus · Accepted Answer

.0268LSL = 50 - 1 = 49USL = 50 + 1 = 51 Estimated percentage of tires not meeting the specifications is 2.68%.

Suppose That and R Charts Are Based on Subgroups