55. The mail order firm of L. L. Pea receives an averageof 200 calls per hour, where times between calls areexponentially distributed. It takes an L. L. Pea operatoran average of three minutes to handle a call. If a callergets a busy signal, L. L. Pea assumes that he or she willcall a competing mail-order company, and L. L. Pea willlose an average of $30 in profit. The cost of keeping aphone line open is $9 per hour. How many operatorsshould L. L. Pea have on duty? Use simulation to answerthis question. Does the answer depend on whether theservice times are exponentially distributed?

17- Consider a system in which service time is exponentially distributed. If the average service time becomes twice, the coefficient of variation of service time becomes twice as well. True False

While performing a procedure, a surgeon accidentally cuts a patient's nerve causing permanent neurological damage. After reviewing the event, the hospital's risk management committee determined that the surgeon was not qualified to perform this procedure. Which action should the hospital implement to avoid this type of situation in the future? Ensure proper privileging prior to patient care Require pairing of surgeons to minimize risk Institute continuing education programs for surgeons Decrease scheduled surgeries per day

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In what way might the i rst-come, i rst-served rule be unfair to the customer waiting for service in a bank or hospital?

13. Give an example of a single-phase queuing system.

In an M/MA queueing system, the arrival rate is 5 customers per hour and the service rate is 9 customers per hour. If the service process is automated (resulting in no varlation in service times but the same service rate), what will be the resulting performance measurements? (Round your answers to 3 decimal places.) a. What is the utilization? Ubization b. What is the expected number of customers in the system (L)? Number of customers c. What is the expected walting time (in hours) for the system (W? Waiting timetin nours)

please answer part e

How many years (t) can we expect to do business with a customer? Thetotal number of years is denoted by T.

Ashley’s department store in Kansas City maintains a successful catalog sales department in which four clerk takes orders by telephone. If four clerks are occupied on four-lines, incoming phone calls to the catalog department are answered automatically by a recording machine and asked to wait. As soon as the clerk is free, the party that has waited for the longest is transferred and answered first. Calls come in an average of 3 minutes. The clerk is capable of taking an order in an average of 10 minutes. Calls tend to follow a Poisson distribution, and service times tend to be exponential. a. λ= μ= b. Calculate P0 c. How many callers, on average, are waiting to place an order under the current operating system?