Multiple Choice
TABLE 18-3
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 18-3,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?
A) 47.60
B) 56.15
C) 57.15
D) 58.05
Correct Answer:
Verified
Correct Answer:
Verified
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