Problem 2.

Car doors are made and tested for blemishes. They were found to have an average

of

5 blemishes per car door. There are

250 opportunities

for blemishes to occur. Find the control limits of the C-Chart. Assume that the

process is centered and the specification is 2-sided.

Cbar:

UCLC:

Cp:

NOTE:

5 blemishes in

Reject Rate (RR) =

0.02

LCLC:

250 opportunities

and f(Z) = RR/2 =

0.01