I have no idea how to find the proportion for question c, any help would be greatly appreciated
C-Spec, Inc., is attempting
to determine whether an existing machine is capable of milling an engine part
that has a key
specification of 4 ± .003 inches.
After a trial run on this machine, C-Spec has determined that the
machine has a standard deviation of .002 inch.
(a) Calculate the process capability for this machine.
(b) Should C-Spec use this machine to produce this part? Why or why not?
(c) What proportion of items will meet specifications on this