What is the value of the UCL of the R chart constructed for the GCC?

What is the value of the UCL of the R chart constructed for the GCC? Correct Answer UCL = D4 R

The GCC is prepared with the same way as the simple x and R charts are constructed for individual process streams. The value of the UCL of the R chart of the GCC is, UCL=D4 R

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What is the ratio of the UCL to LCL of the same GCC R chart?