please show work to figure this out! thanks!

1. A graphics reproduction firm has ten units of equipment that are automatic but occasionally become inoperative because of the need for supplies, maintenance, or repair. Each unit requires service roughly 1.5 times each hour, or, more precisely, each unit of equipment runs an average of 40 minutes before needing service. Service times vary widely, ranging from a simple service (such as pressing a restart switch or repositioning paper) to more involved equipment disassembly. The average service time, however, is ten minutes. Equipment downtime results in a loss of $20 per hou The one equipment attendant is paid $6 per hour. Using finite queuing analysis, answer the following questions: a. What is the average number of units in line? b. What is the average number of units still in operation? c. What is the average number of units being serviced? d. The firm is considering adding another attendant at the same $6 rate. Should the firm do it