Question: Please explain where all numbers that are not given come from. We want to develop a three sigma R chart of population with unknown standard

Please explain where all numbers that are not given come from.

We want to develop a three sigma R chart of population with unknown standard deviation. We know the average range based on several samples of size 10 unites is 5. Which of the following is the resulting UCL? A. 20.9 B. 8.9 C. 7.02 D.5 E. 3.1

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