The phase of the Six Sigma DMAIC process focuses on how to maintain the improvements, which includes putting tools in place to ensure that the key variables remain within the maximum acceptable ranges under the modified process.

control

Explanation:

Based on the information provided within the question it can be said that the phase that is being mentioned in this scenario is the control phase of the Six Sigma DMAIC process. This stage focuses on making sure that the action item that has been created in the previous stage (improve phase) is well-implemented and maintained, meaning that it is kept within acceptable ranges, thus controlling it.

a.s= 230t– 110; 1500 lbc.t= 230s– 110; 1500 lbb.s= 230t+ 110; 1720 lbd.s= 199t– 110; 1280 lb