Question: The data for an average-and-range control chart for subgroups of n = 7 show a grand average of 24.6 and an average range of 3.6.

The data for an average-and-range control chart for subgroups of n = 7 show a grand average of 24.6 and an average range of 3.6. What is the lower control limit for the Range chart?

Question 2 options:

	1.87
	0
	0.274
	23.09

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