Question: The data for an average-and-range control chart for subgroups of n = 9 show a grand average of 26.8 and an average range of 2.6.

The data for an average-and-range control chart for subgroups of n = 9 show a grand average of 26.8 and an average range of 2.6. What is the lower control limit for the Range chart?

Question 25 options:

0.368

0

23.09

0.274

0.5

1.87

0.4784

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