Suppose That and R Charts Are Based on Subgroups

question 120

Multiple Choice

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.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)

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