A Manufacturer of Solid Wood Cabinetry Requires That Its Lumber

Multiple Choice

A manufacturer of solid wood cabinetry requires that its lumber has moisture content (MC) between 5% and 9%.Twenty-five subgroups, each consisting of six pieces of lumber, yield an average MC of 6.95% and an average range of 2.2%.The estimated process standard deviation () is ________________________ .

A) 0.18%
B) 0.87%
C) 1.22%
D) 2.2%
E) 2.74%