Industrial Engi...

A PERT activity has an optimistic time estimate of 3 days, a pessimistic time estimate of 8 days, and a most likely time estimate of 10 days. What is the expected time of this activity?

A repair shop is manned by a single worker. Customers arrive at the rate of 30 per hour. Time required to provide service is exponentially distributed with mean of 100 seconds. The mean waiting time of a customer; needing repair facility in the queue is _______ minute

In a shop, customers arrive at rate of 20 per hour and are getting served at rate of 30 per hour. The waiting time of customer in the queue is

At a workstation, 6 jobs arrives every minute. The mean time spent on each job in the workstation is 1/10 minute. The mean steady state number of job in the system is ___________

In a factory, breakdown of machines occur at 3 machines/hour and breakdown time at one machine costs Rs. 60/hour. There are two choices for repairmen. Repairman ‘A’ demands Rs. 20/hour and repair machines at the rate of 4 per hour. While the repairman ‘B’ demands Rs. 30/hour and repair machines at 6 per hour. Which repairman should be hired and what will be cost

In a facility, the jobs arrive at an average rate of 4 in a 12-hour shift. The arrival rate of jobs follow the Poisson distribution. The average service time follows exponential distribution and the average service time of a job on the facility is 60 minutes. What will be the idle time in hours of the facility per shift?