Explain to what extent the process for producing Sam’s Long Life bulbs in Problem 3.37 would have to be improved in order to achieve Six Sigma quality. 

Data in Problem 3.37 

Sam’s Long Life 75-watt light bulbs are designed to have a life of 1125 hours with tolerances of ±210 hours. The process that makes light bulbs has a mean of 1050 hours, with a standard deviation of 55  hours. Compute the process capability ratio and the process capability index, and comment on the overall capability of the process.