TABLE 14-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic. Accordingly, the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.
-Referring to Table 14-3, suppose the analyst constructs an 
chart to see if the production process is in control. What is the lower control limit (LCL) for this chart?
Definitions:
Grams
A mass measurement unit representing 0.001 of a kilogram.
Pounds
A unit of weight commonly used in the United States, equal to 0.453592 kilograms.
Kg
A unit of mass equal to 1,000 grams or approximately 2.20462 pounds, used in the metric system.
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