Question

Variable data has been organized into subgroups of 16 measurements each. The subgroup mean were calculated...

Variable data has been organized into subgroups of 16 measurements each. The subgroup mean were calculated as follows. 36, 25, 27, 25, and 43. The ranges of the subgroup were found to be 8, 5, 4, 5, and 5 respectively. What is the lower control limit of the data?

The answer is 30.66 just need help on how to get it.

Math   Statistics-And-Probability   
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