A large beverage company would like to use a statistical process control to monitor how much liquid beverage it puts into each bottle. The company operated its bottle filling line under careful supervision, confident that the line was under complete control, for seven hours. Each hour, a sample of 20 bottles was taken off the line and the amount of liquid in each bottle was carefully measured. This is the resulting data:

Sample No.	Sample Mean (ml)	Sample Range (ml)
#1	350.4	0.5
#2	349.6	0.5
#3	349.6	0.7
#4	349.5	0.4
#5	349.8	0.5
#6	350.4	0.9
#7	349.8	0.3

Which of the following is closest to the upper control limit on the beverage companys range chart?

	a.	351.15 ml
	b.	0.5 ml
	c.	0.86 ml
	d.	350.68 ml
	e.	1.92 ml