Free IIA IIA-CIA-Part3 Exam Braindumps (page: 59)

The drive-through service at a fast-food restaurant consists of driving up to place an order, advancing to a window to pay for the order, and then advancing to another window to receive the items ordered. This type of waiting-line system is:

  1. Single channel, single phase.
  2. Single channel, multiple phase.
  3. Multiple channel, single phase.
  4. Multiple channel, multiple phase.

Answer(s): B

Explanation:

The drive-through represents a single queue channel). Because this waiting line has three services in series, it may be said to be multiple phase. Another example is the typical factory assembly line. This terminology channel, phase), however, is not used by all writers on queuing theory.



A post office serves customers in a single line at one service window. During peals periods, the rate of arrivals has a Poisson distribution with an average of 100 customers per hour and service times that are exponentially distributed with an average of 0 seconds per customer.
From this, one can conclude that the:

  1. Queue will expand to infinity.
  2. Server' will be idle one-sixth of the time.
  3. Average rate is 100 customers per hour.
  4. Average customer waiting time is minutes.

Answer(s): A

Explanation:

One hundred customers arrive in line per hour and only 60 are serviced per hour. Accordingly, the queue will expand to infinity during peaty periods.



Only two companies manufacture Product A. The finished product is identical regardless of which company manufactures it. The cost to manufacture Product A is US $1, and the selling price is US $2. One company considers reducing the price to achieve 100c'% market share but fears the other company will respond by further reducing the price. Such a scenario would involve a:

  1. No-win strategy.
  2. Dual-win strategy.
  3. One win-one lose strategy.
  4. Neutral strategy.

Answer(s): A

Explanation:

If bath firms reduce the selling price of Product A, neither will gain sales and the resultant price war will cause bath firms to earn lower profits. This outcome is inevitable when reduced profit margins do not result in a significant increase in sales. The effect is a no-win strategy. A bank has two drive-in lanes to serve customers: one attached to the bank itself and one on an island. One teller serves bath stations. The bank is interested in determining the average waiting times of customers and has developed a model based on random numbers. The two key factors are the time between successive car arrivals and the time customers wait in line. Assume that the analysis begins with cars just arriving at bath service windows. bath requiring 3 minutes of service time. Car 1 is the attached window attached to the bank unless that window has more cars waiting than the island window. The lone teller will always serve the car that arrived first. If two cars arrive simultaneously, the one at the attached window will be served before the one at the island.



The arrival time follows which probability distribution?

  1. Binomial
  2. Chi-Square
  3. Poisson
  4. Exponential

Answer(s): C

Explanation:

Queuing models assume that arrivals follow a Poisson process: the events arrivals) are independent, any number of events must be possible in the interval of time, the probability {of an event is proportional to the length of the interval, and the probability {of more than one event is negligible if the interval is sufficiently} small. If is the average number of events in a given interval, k is the number of events, and e is the natural logarithm 2.71828...), the probability of k is. f K) = k e - k !
A bank has two drive-in lanes to serve customers: one attached to the bank itself and one on an island. One teller serves bath stations. The bank is interested in determining the average waiting times of customers and has developed a model based on random numbers. The two key factors are the time between successive car arrivals and the time customers wait in line.
Assume that the analysis begins with cars just arriving at bath service windows bath requiring 3 minutes of service time. Car 1 is the attached window attached to the bank unless that window has more cars waiting than the island window. The lone teller will always serve the car that arrived first. If two cars arrive simultaneously, the one at the attached window will be served before the one at the island.



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