Cpk=(1-k)Cp 其中K=2E/T，Cp =T/6Sigma该题中，E=0.022，T=0.35，Sigma=S=0.056所以CPK=(1-2*0.022/0.35)*0.35/0.056=5.46
Cpk=T-2E/6S =(1-k)Cp =(0.35-2*0.022)/6*0.056
