The Pacific Fruit Company has designed its packaging process for boxes to hold a net weight (nominal value) of 9.0 oz of raisins with tolerances of plus or minus 0.5 oz. Given a process mean of 9.00, an average range of 0.57 and a UCL of 1.21 and a LCL of 0, compute the process capability ratio and index.

Cp = Round your answer to 2 decimal places, the tolerance is +/-0.05

Cpk= Round your answer to 2 decimal places, the tolerance is +/-0.05

Which of the following statements is true concerning the process capability ratio and index?

capable or incapable, centered or uncentered

My teacher has given me the following information

Finding sigma (standard deviation)

You have to work backwards to solve for sigma. Follow my logic below.

The formulas for the UCL and LCL are

(X-bar) +/- (margin of error)the margin of error = 0.33 - this is a given value - just accept and use

(X-bar) +/- (3*sigma)....solve for sigma

****ANSWERS ARE NOT .68 FOR CP OR CPK******