Create X-Bar and R Charts

Multiple Choice

Create X-bar and R charts.
-A company that manufactures health food snacks produces low sodium rice chips. To
Monitor the process for sodium levels, chips are selected periodically and the amount of
Sodium (mg) measured. For each of thirty samples consisting of 8 chips, the mean and
Range in sodium content is determined. The average of the means across all samples is 55
Mg and the average range is 2.2 mg. The lower and upper control limits for the x-bar
Chart are

A) 52.67 and 57.33 mg.
B) 51.15 and 58.85 mg.
C) 54.18 and 55.82 mg.
D) 48.89 and 57.61 mg.
E) 37.84 and 72.16 mg.