Statistical Process Control

$\backslash$table$[[$Sample$,$Mean,Range$],[1,26\mathrm{.}91,3\mathrm{.}51],[2,25\mathrm{.}79,2\mathrm{.}62],[3,26\mathrm{.}14,3\mathrm{.}26]]$

The table above contains the data for $3$ samples, each of which has $7$ observations. Determine the upper control limit for the range chart. Calculate your answer to $3$ decimal places.

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