You manage one stage of a manufacturing process that uses machines to stamp out metal parts. You are trying to figure out how many machines to have at that stage of the process. You have an exponential/poisson arrival rate of 155 jobs per hour. Each machine has completion times governed by an exponential distribution with an average of 16 jobs/hour.
You want to have enough machines that the average waiting time at this stage is less than 3 minutes.
Which row of the table will you use to find the correct number of machines? Enter your answer as a number to 1 decimal place.