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1. The Hoylake Rescue Squad receives an emergency call every 1, 2, 3, 4, 5, or 6 hours, according to the following probability distribution. The squad is on duty 24 hours per day, 7 days per week: Time Between Emergency Calls (hr.) Probability 1 0.15 2 0.10 3 0.20 4 0.25 5 0.20 6 0.10 1.00
a. Simulate the emergency calls for 3 days (note that this will require a “running†, or cumulative, hourly clock), using the random number table. b. Compute the average time between calls and compare this value with the expected value of the time between calls from the probability distribution. Why are the result different? 2. The time between arrivals of cars at the Petroco Services Station is defined by the following probability distribution: Time Between Emergency Calls (hr.) Probability 1 0.35 2 0.25 3 0.20 4 0.20 1.00
MAT540 Homework Week 3 Page 2 of 3
a. Simulate the arrival of cars at the service station for 20 arrivals and compute the average time between arrivals. b. Simulate the arrival of cars at the service station for 1 hour, using a different stream of random numbers from those used in (a) and compute the average time between arrivals. c. Compare the results obtained in (a) and (b). 3. The Dynaco Manufacturing Company produces a product in a process consisting of operations of five machines. The probability distribution of the number of machines that will break down in a week follows: Machine Breakdowns Per Week Probability 0 0.10 1 0.20 2 0.15 3 0.30 4 0.15 5 0.10 1.00
a. Simulate the machine breakdowns per week for 20 weeks. b. Compute the average number of machines that will break down per week.
4. Simulate the following decision situation for 20 weeks, and recommend the best decision. A concessions manager at the Tech versus A
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