A new printing machine is set or calibrated to print 25 copies per minute. On each of four days, the printer's output is measured five times. The data will be used to construct a process control chart to monitor the printing process. The results of the printing process are in the following table. 
What is the value of the upper control limit factor for a range chart?
Definitions:
Progenitor Cells
Cells that have the capacity to differentiate into more specialized cell types, playing a key role in growth, development, and tissue repair.
Neuroblasts
Immature nerve cells that have the potential to develop into mature neurons.
Nerve Growth Factor
Nerve growth factor is a protein essential for the growth, maintenance, and survival of certain neurons in the peripheral and central nervous system.
EGF
Epidermal Growth Factor (EGF) is a protein that stimulates cell growth, proliferation, and differentiation by binding to its receptor, EGFR.
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