In an evaluation of labor assignment rules when workers are not perfectly interchangeable, Paul M. Bobrowski and Paul Sungchil Park created a dynamic job shop with 9 work centers and 9 workers, both numbered 1–9. The efficiency of each worker is specified in the following labor efficiency matrix, which represents the degree of worker cross-training (Source: Bobrowski, P. M., and P. S. Park, “An evaluation of labor assignment rules,” Journal of Operations Management, Vol. 11, September 1993).
(a) For what work center(s) is worker 7 least efficient?
(b) For what work center is worker 1 most efficient?