Each Day for Two Workweeks (10 Days Total), George Weighs

Multiple Choice

Each day for two workweeks (10 days total) , George weighs 4 bags from that day's production. If the average of the means is 14 oz. and the average range is 0.4 oz., what is the lower control limit for an x-bar chart for this process?

A) 13.7084 oz.
B) 13.8768 oz.
C) 14.2916 oz.
D) 12.8000 oz.
E) 13.5908 oz.