Your team lead wanted to find out if her process was capable and operating within customer requirements. X-bar of the process equals 100, and the short term standard deviation (s) is 10. Customers indicate that they are satisfied as long as the process performs between 70 and 120. Calculate the capability using the correct index
a. cp=0.83 and cpk= 0.33
b cp=0.83 and cpk= 0.67
c cp= 1.2 and cpk= 0.67
d cp=1.2 and cpk=1.00