An analyst has kept track of the number of defectives produced by five workers on five different machines. The results are shown below for a run of 400 units per machine:

Worker	Machine
	A	B	C	D	E
1	9	7	4	6	2
2	7	4	5	2	1
3	3	4	3	2	3
4	9	7	8	6	5
5	0	3	2	4	3

• Determine a set of assignments that will minimize the total number of errors for a given run size.
• What is the total number of defectives expected for the optimal assignment?
• If another machine was available and the number of defectives produced by the five workers for a runoff 400 units was 4, 4, 2, 3, and 1 respectively. Determine the new set of assignments that will minimize the total number of expected defectives.
• Which machine will not be used?