3 Answer Sheet Due by midnight December 3rd 2015. Copy and paste the part of this answer sheet below the dotted into a Course Message titled Assignment 3 Answer Sheet. Enter the letter of the best correct answer. If you think an item has no correct answer, or more than one best correct answer then say so and explain your reasoning (on this paper). In all other cases, do not show your reasoning or calculations. To save paper, just submit the part of this page below this line. ----------------------------------------------------------------------------------------Print your name here: >>> __________________________________________ (-2 points if your name is missing.) 1. 10. 19. 2. 11. 20. 3. 12. 21. 4. 13. 22. 5. 14. 23. 6. 15. 24. 7. 16. 25. 8. 17. 26. 9. 18. Page 1 of 10 Assignment 3 Questions Instructions: Due by midnight December 3rd 2015 Feel free to use the software that came with the text, but do not turn in computer output from that software. How to submit your answers: Do not turn in this test paper. Use the Test 3 Answer Sheet to indicate the letter of the best answer for each item. If you think there are no good answers, or more than one best answer, explain your reasoning on that Answer Sheet. In all other cases, do not show your reasoning. Copy and paste the part of your answer sheet below the dotted line into a Course Message titled Test 3 Answer Sheet. If that is not feasible then attach your test paper to an email. Do not fax your test Each item is worth 4 points. 104 possible points, graded as if it were 100 possible. This gives you 4 points for possible extra credit. ************ 1. The critical path of a network is the A) shortest time path through the network. B) path with the fewest activities. C) path with the most activities. D) longest time path through the network. E) None of the above 2. The first step in planning and scheduling a project is to develop the A) employee scheduling plan. B) PERT/CPM network diagram. C) critical path. D) work breakdown structure. E) variance calculations for each activity. Table 13-4 The following represents a project with known activity times. All times are in weeks. Page 2 of 10 Activity A B C D E F G Immediate Predecessor A B C, D B E, F Time 4 3 2 7 4 5 4 3. Using the data in Table 13-4, what is the minimum possible time required for completing the project? (a) (b) (c) (d) (e) 8 12 18 10 none of the above 4. Using the data in Table 13-4, what is the latest possible time that C may be started without delaying completion of the project? (a) (b) (c) (d) (e) 0 4 8 10 none of the above 5. Using the data in Table 13-4, compute the slack time for activity D. (a) (b) (c) (d) (e) 0 5 3 6 none of the above 6. Consider a project that has an expected completion time of 50 weeks and a standard deviation of 9 weeks. What is the probability that the project is finished in 57 weeks or fewer? (Round to two decimals.) Page 3 of 10 (a) (b) (c) (d) (e) 0.68 0.78 0.22 0.32 none of the above The following table provides information for the next two questions. Table 13-6 Activit Immediate y Predecesso r A B C A D A E B, C F B G D, E H G, F Optimisti c 2 2 1 5 6 12 1 1 Most Likely Pessimistic 3 5 2 5 7 12 5 4 7. Which activities are part of the critical path? (a) (b) (c) (d) (e) A, B, E, G, H A, C, E, G, H A, D, G, H B, F, H none of the above 8. What is the variance of the critical path? (a) (b) (c) (d) (e) 5.222 4.364 1.362 5.144 none of the above Table 14-1 M/M/2 4 8 9 5 8 12 9 8 Expected t 3 5 3 5 7 12 5 4.167 0.333 1.000 1.330 0.000 0.333 0.000 1.333 1.167 2 0.111 1.000 1.780 0.000 0.111 0.000 1.780 1.362 Page 4 of 10 Mean Arrival Rate: Mean Service Rate: Number of Servers: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: Probability of No Units in System: 9 occurrences per minute 7 occurrences per minute 2 2.191 0.905 14.609 minutes 6.037 minutes 0.643 0.217 9. According to the information provided in Table 14-1, on average, how many units are in the line? (a) (b) (c) (d) (e) 0.643 2.191 2.307 0.217 0.905 10. According to the information provided in Table 14-1, what proportion of time is at least one server busy? (a) (b) (c) (d) (e) 0.643 0.905 0.783 0.091 none of the above 11. Using the information provided in Table 14-1 and counting each person being served and the people in line, on average, how many people would be in this system? (a) (b) (c) (d) (e) 0.905 2.191 6.037 14.609 none of the above 12. According to the information provided in Table 14-1, what is the average time spent Page 5 of 10 by a person in this system? (a) (b) (c) (d) (e) 0.905 minutes 2.191 minutes 6.037 minutes 14.609 minutes none of the above 13. According to the information provided in Table 14-1, what percentage of the total available service time is being used? (a) (b) (c) (d) (e) 90.5% 21.7% 64.3% It could be any of the above, depending on other factors. none of the above Table 14-5 M/D/1 Mean Arrival Rate: Constant Service Rate: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: 5 occurrences per minute 7 occurrences per minute 1.607 0.893 0.321 minutes 0.179 minutes 0.714 14. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how much time is spent waiting in line? (a) (b) (c) (d) (e) 1.607 minutes 0.714 minutes 0.179 minutes 0.893 minutes none of the above Page 6 of 10 15. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how many customers are in the system? (a) (b) (c) (d) (e) 0.893 0.714 1.607 0.375 none of the above 16. According to the information provided in Table 14-5, which presents a queuing problem solution for a queuing problem with a constant service rate, on average, how many customers arrive per time period? (a) 5 (b) 7 (c) 1.607 (d) 0.893 (e) none of the above Table 15-2 A pharmacy is considering hiring another pharmacist to better serve customers. To help analyze this situation, records are kept to determine how many customers will arrive in any 10-minute interval. Based on 100 tenminute intervals, the following probability distribution has been developed and random numbers assigned to each event. Number of Arrivals Probability Interval of Random Numbers Page 7 of 10 6 7 8 9 10 0.2 0.3 0.3 0.1 0.1 01-20 21-50 51-80 81-90 91-00 17. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 18, 89, and 67, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) (b) (c) (d) (e) 22 23 24 25 none of the above 18. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 20, 50, and 79, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) 18 (b) 19 (c) 20 (d) 21 (e) none of the above 19. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10 inclusive. Suppose the next 3 random numbers were 02, 81, and 18. These numbers are used to simulate arrivals into the pharmacy. What would the average number of arrivals per 10-minute period be based on this set of occurrences? (a) (b) (c) (d) (e) 6 7 8 9 none of the above Page 8 of 10 Table 15.3 A pawn shop in Arlington, Texas, has a drive-through window to better serve customers. The following tables provide information about the time between arrivals and the service times required at the window on a particularly busy day of the week. All times are in minutes. Time Between Arrivals Probability 1 2 3 4 0.1 0.3 0.4 0.2 Service Time Interval of Random Numbers 01-10 11-40 41-80 81-00 Probability Interval of Random Numbers 1 0.2 01-20 2 0.4 21-60 3 0.3 61-90 4 0.1 91-00 The first random number generated for arrivals is used to tell when the first customer arrives after opening. 20. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. If the store opens at 8:00a.m. and random numbers are used to generate arrivals, what time would the first customer arrive if the first random number were 02? (a) (b) (c) (d) (e) 8:01 8:02 8:03 8:04 none of the above Page 9 of 10 21. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first random number to generate an arrival is 39, while the first service time is generated by the random number 94. What time would the first customer finish transacting business? (a) (b) (c) (d) (e) 8:03 8:04 8:05 8:06 none of the above 22. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first 3 random numbers to generate arrivals are 09, 89, and 26. What time does the third customer arrive? (a) (b) (c) (d) (e) 8:07 8:08 8:09 8:10 none of the above 23. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first two random numbers for arrivals are 95 and 08. The first two random numbers for service times are 92 and 18. At what time does the second customer finish transacting business? (a) 8:07 (b) 8:08 (c) 8:09 (d) 8:10 (e) none of the above Table 15-4 Variable Value 0 1 2 3 4 Number of Runs Probability 0.08 0.23 0.32 0.28 0.09 200 Cumulative Probability 0.08 0.31 0.63 0.91 1.00 Page 10 of 10 Average Value 2.1 0 24. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is 2 or fewer? (a) (b) (c) (d) (e) 0.23 0.31 0.32 0.63 none of the above 25. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is more than 4? (a) (b) (c) (d) (e) 0 0.08 0.09 1.00 none of the above 26. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, based on this simulation run, what is the average number of breakdowns per day? (a) 2.00 (b) 2.10 (c) 2.50 (d) 200 (e) none of the above Assignment 3 Answer Sheet Due by midnight December 3rd 2015. Copy and paste the part of this answer sheet below the dotted into a Course Message titled Assignment 3 Answer Sheet. Enter the letter of the best correct answer. If you think an item has no correct answer, or more than one best correct answer then say so and explain your reasoning (on this paper). In all other cases, do not show your reasoning or calculations. To save paper, just submit the part of this page below this line. ----------------------------------------------------------------------------------------Print your name here: >>> __________________________________________ (-2 points if your name is missing.) 1. D 10. C 19. B 2. D 11. B 20. A 3. C 12. D 21. D 4. C 13. 5. A 14. C C 22. A 23. C 6. B 15. C 24. D 7. B 16. A 25. A 8. D 17. B 26. C 9. E 18. D Page 1 of 10 Assignment 3 Questions Instructions: Due by midnight December 3rd 2015 Feel free to use the software that came with the text, but do not turn in computer output from that software. How to submit your answers: Do not turn in this test paper. Use the Test 3 Answer Sheet to indicate the letter of the best answer for each item. If you think there are no good answers, or more than one best answer, explain your reasoning on that Answer Sheet. In all other cases, do not show your reasoning. Copy and paste the part of your answer sheet below the dotted line into a Course Message titled Test 3 Answer Sheet. If that is not feasible then attach your test paper to an email. Do not fax your test Each item is worth 4 points. 104 possible points, graded as if it were 100 possible. This gives you 4 points for possible extra credit. ************ 1. The critical path of a network is the A) shortest time path through the network. B) path with the fewest activities. C) path with the most activities. D) longest time path through the network. E) None of the above 2. The first step in planning and scheduling a project is to develop the A) employee scheduling plan. B) PERT/CPM network diagram. C) critical path. D) work breakdown structure. E) variance calculations for each activity. Table 13-4 The following represents a project with known activity times. All times are in weeks. Page 2 of 10 Activity A B C D E F G Immediate Predecessor A B C, D B E, F Time 4 3 2 7 4 5 4 3. Using the data in Table 13-4, what is the minimum possible time required for completing the project? (a) (b) (c) (d) (e) 8 12 18 10 none of the above 4. Using the data in Table 13-4, what is the latest possible time that C may be started without delaying completion of the project? (a) (b) (c) (d) (e) 0 4 8 10 none of the above 5. Using the data in Table 13-4, compute the slack time for activity D. (a) (b) (c) (d) (e) 0 5 3 6 none of the above 6. Consider a project that has an expected completion time of 50 weeks and a standard deviation of 9 weeks. What is the probability that the project is finished in 57 weeks or fewer? (Round to two decimals.) Page 3 of 10 (a) (b) (c) (d) (e) 0.68 0.78 0.22 0.32 none of the above The following table provides information for the next two questions. Table 13-6 Activit Immediate y Predecesso r A B C A D A E B, C F B G D, E H G, F Optimisti c 2 2 1 5 6 12 1 1 Most Likely Pessimistic 3 5 2 5 7 12 5 4 7. Which activities are part of the critical path? (a) (b) (c) (d) (e) A, B, E, G, H A, C, E, G, H A, D, G, H B, F, H none of the above 8. What is the variance of the critical path? (a) (b) (c) (d) (e) 5.222 4.364 1.362 5.144 none of the above Table 14-1 M/M/2 4 8 9 5 8 12 9 8 Expected t 3 5 3 5 7 12 5 4.167 0.333 1.000 1.330 0.000 0.333 0.000 1.333 1.167 2 0.111 1.000 1.780 0.000 0.111 0.000 1.780 1.362 Page 4 of 10 Mean Arrival Rate: Mean Service Rate: Number of Servers: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: Probability of No Units in System: 9 occurrences per minute 7 occurrences per minute 2 2.191 0.905 14.609 minutes 6.037 minutes 0.643 0.217 9. According to the information provided in Table 14-1, on average, how many units are in the line? (a) (b) (c) (d) (e) 0.643 2.191 2.307 0.217 0.905 10. According to the information provided in Table 14-1, what proportion of time is at least one server busy? (a) (b) (c) (d) (e) 0.643 0.905 0.783 0.091 none of the above 11. Using the information provided in Table 14-1 and counting each person being served and the people in line, on average, how many people would be in this system? (a) (b) (c) (d) (e) 0.905 2.191 6.037 14.609 none of the above 12. According to the information provided in Table 14-1, what is the average time spent Page 5 of 10 by a person in this system? (a) (b) (c) (d) (e) 0.905 minutes 2.191 minutes 6.037 minutes 14.609 minutes none of the above 13. According to the information provided in Table 14-1, what percentage of the total available service time is being used? (a) (b) (c) (d) (e) 90.5% 21.7% 64.3% It could be any of the above, depending on other factors. none of the above Table 14-5 M/D/1 Mean Arrival Rate: Constant Service Rate: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: 5 occurrences per minute 7 occurrences per minute 1.607 0.893 0.321 minutes 0.179 minutes 0.714 14. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how much time is spent waiting in line? (a) (b) (c) (d) (e) 1.607 minutes 0.714 minutes 0.179 minutes 0.893 minutes none of the above Page 6 of 10 15. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how many customers are in the system? (a) (b) (c) (d) (e) 0.893 0.714 1.607 0.375 none of the above 16. According to the information provided in Table 14-5, which presents a queuing problem solution for a queuing problem with a constant service rate, on average, how many customers arrive per time period? (a) 5 (b) 7 (c) 1.607 (d) 0.893 (e) none of the above Table 15-2 A pharmacy is considering hiring another pharmacist to better serve customers. To help analyze this situation, records are kept to determine how many customers will arrive in any 10-minute interval. Based on 100 tenminute intervals, the following probability distribution has been developed and random numbers assigned to each event. Number of Arrivals Probability Interval of Random Numbers Page 7 of 10 6 7 8 9 10 0.2 0.3 0.3 0.1 0.1 01-20 21-50 51-80 81-90 91-00 17. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 18, 89, and 67, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) 22 (b) 23 (c) 24 (d) 25 (e) none of the above 18. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 20, 50, and 79, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) 18 (b) 19 (c) 20 (d) 21 (e) none of the above 19. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10 inclusive. Suppose the next 3 random numbers were 02, 81, and 18. These numbers are used to simulate arrivals into the pharmacy. What would the average number of arrivals per 10-minute period be based on this set of occurrences? (a) 6 (b) 7 (c) 8 (d) 9 (e) none of the above Page 8 of 10 Table 15.3 A pawn shop in Arlington, Texas, has a drive-through window to better serve customers. The following tables provide information about the time between arrivals and the service times required at the window on a particularly busy day of the week. All times are in minutes. Time Between Arrivals Probability 1 2 3 4 0.1 0.3 0.4 0.2 Service Time Interval of Random Numbers 01-10 11-40 41-80 81-00 Probability Interval of Random Numbers 1 0.2 01-20 2 0.4 21-60 3 0.3 61-90 4 0.1 91-00 The first random number generated for arrivals is used to tell when the first customer arrives after opening. 20. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. If the store opens at 8:00a.m. and random numbers are used to generate arrivals, what time would the first customer arrive if the first random number were 02? (a) (b) (c) (d) (e) 8:01 8:02 8:03 8:04 none of the above Page 9 of 10 21. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first random number to generate an arrival is 39, while the first service time is generated by the random number 94. What time would the first customer finish transacting business? (a) 8:03 (b) 8:04 (c) 8:05 (d) 8:06 (e) none of the above 22. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first 3 random numbers to generate arrivals are 09, 89, and 26. What time does the third customer arrive? (a) (b) (c) (d) (e) 8:07 8:08 8:09 8:10 none of the above 23. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first two random numbers for arrivals are 95 and 08. The first two random numbers for service times are 92 and 18. At what time does the second customer finish transacting business? (a) 8:07 (b) 8:08 (c) 8:09 (d) 8:10 (e) none of the above Table 15-4 Variable Value 0 1 2 3 4 Number of Runs Probability 0.08 0.23 0.32 0.28 0.09 200 Cumulative Probability 0.08 0.31 0.63 0.91 1.00 Page 10 of 10 Average Value 2.1 0 24. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is 2 or fewer? (a) 0.23 (b) 0.31 (c) 0.32 (d) 0.63 (e) none of the above 25. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is more than 4? (a) (b) (c) (d) (e) 0 0.08 0.09 1.00 none of the above 26. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, based on this simulation run, what is the average number of breakdowns per day? (a) 2.00 (b) 2.10 (c) 2.50 (d) 200 (e) none of the above Assignment 3 Answer Sheet Due by midnight December 3rd 2015. Copy and paste the part of this answer sheet below the dotted into a Course Message titled Assignment 3 Answer Sheet. Enter the letter of the best correct answer. If you think an item has no correct answer, or more than one best correct answer then say so and explain your reasoning (on this paper). In all other cases, do not show your reasoning or calculations. To save paper, just submit the part of this page below this line. ----------------------------------------------------------------------------------------Print your name here: >>> __________________________________________ (-2 points if your name is missing.) 1. D 10. C 19. B 2. D 11. B 20. A 3. C 12. D 21. D 4. C 13. 5. A 14. C C 22. A 23. C 6. B 15. C 24. D 7. B 16. A 25. A 8. D 17. B 26. C 9. E 18. D Page 1 of 10 Assignment 3 Questions Instructions: Due by midnight December 3rd 2015 Feel free to use the software that came with the text, but do not turn in computer output from that software. How to submit your answers: Do not turn in this test paper. Use the Test 3 Answer Sheet to indicate the letter of the best answer for each item. If you think there are no good answers, or more than one best answer, explain your reasoning on that Answer Sheet. In all other cases, do not show your reasoning. Copy and paste the part of your answer sheet below the dotted line into a Course Message titled Test 3 Answer Sheet. If that is not feasible then attach your test paper to an email. Do not fax your test Each item is worth 4 points. 104 possible points, graded as if it were 100 possible. This gives you 4 points for possible extra credit. ************ 1. The critical path of a network is the A) shortest time path through the network. B) path with the fewest activities. C) path with the most activities. D) longest time path through the network. E) None of the above 2. The first step in planning and scheduling a project is to develop the A) employee scheduling plan. B) PERT/CPM network diagram. C) critical path. D) work breakdown structure. E) variance calculations for each activity. Table 13-4 The following represents a project with known activity times. All times are in weeks. Page 2 of 10 Activity A B C D E F G Immediate Predecessor A B C, D B E, F Time 4 3 2 7 4 5 4 3. Using the data in Table 13-4, what is the minimum possible time required for completing the project? (a) (b) (c) (d) (e) 8 12 18 10 none of the above 4. Using the data in Table 13-4, what is the latest possible time that C may be started without delaying completion of the project? (a) (b) (c) (d) (e) 0 4 8 10 none of the above 5. Using the data in Table 13-4, compute the slack time for activity D. (a) (b) (c) (d) (e) 0 5 3 6 none of the above 6. Consider a project that has an expected completion time of 50 weeks and a standard deviation of 9 weeks. What is the probability that the project is finished in 57 weeks or fewer? (Round to two decimals.) Page 3 of 10 (a) (b) (c) (d) (e) 0.68 0.78 0.22 0.32 none of the above The following table provides information for the next two questions. Table 13-6 Activit Immediate y Predecesso r A B C A D A E B, C F B G D, E H G, F Optimisti c 2 2 1 5 6 12 1 1 Most Likely Pessimistic 3 5 2 5 7 12 5 4 7. Which activities are part of the critical path? (a) (b) (c) (d) (e) A, B, E, G, H A, C, E, G, H A, D, G, H B, F, H none of the above 8. What is the variance of the critical path? (a) (b) (c) (d) (e) 5.222 4.364 1.362 5.144 none of the above Table 14-1 M/M/2 4 8 9 5 8 12 9 8 Expected t 3 5 3 5 7 12 5 4.167 0.333 1.000 1.330 0.000 0.333 0.000 1.333 1.167 2 0.111 1.000 1.780 0.000 0.111 0.000 1.780 1.362 Page 4 of 10 Mean Arrival Rate: Mean Service Rate: Number of Servers: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: Probability of No Units in System: 9 occurrences per minute 7 occurrences per minute 2 2.191 0.905 14.609 minutes 6.037 minutes 0.643 0.217 9. According to the information provided in Table 14-1, on average, how many units are in the line? (a) (b) (c) (d) (e) 0.643 2.191 2.307 0.217 0.905 10. According to the information provided in Table 14-1, what proportion of time is at least one server busy? (a) (b) (c) (d) (e) 0.643 0.905 0.783 0.091 none of the above 11. Using the information provided in Table 14-1 and counting each person being served and the people in line, on average, how many people would be in this system? (a) (b) (c) (d) (e) 0.905 2.191 6.037 14.609 none of the above 12. According to the information provided in Table 14-1, what is the average time spent Page 5 of 10 by a person in this system? (a) (b) (c) (d) (e) 0.905 minutes 2.191 minutes 6.037 minutes 14.609 minutes none of the above 13. According to the information provided in Table 14-1, what percentage of the total available service time is being used? (a) (b) (c) (d) (e) 90.5% 21.7% 64.3% It could be any of the above, depending on other factors. none of the above Table 14-5 M/D/1 Mean Arrival Rate: Constant Service Rate: Queue Statistics: Mean Number of Units in the System: Mean Number of Units in the Queue: Mean Time in the System: Mean Time in the Queue: Service Facility Utilization Factor: 5 occurrences per minute 7 occurrences per minute 1.607 0.893 0.321 minutes 0.179 minutes 0.714 14. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how much time is spent waiting in line? (a) (b) (c) (d) (e) 1.607 minutes 0.714 minutes 0.179 minutes 0.893 minutes none of the above Page 6 of 10 15. According to the information provided in Table 14-5, which presents the solution for a queuing problem with a constant service rate, on average, how many customers are in the system? (a) (b) (c) (d) (e) 0.893 0.714 1.607 0.375 none of the above 16. According to the information provided in Table 14-5, which presents a queuing problem solution for a queuing problem with a constant service rate, on average, how many customers arrive per time period? (a) 5 (b) 7 (c) 1.607 (d) 0.893 (e) none of the above Table 15-2 A pharmacy is considering hiring another pharmacist to better serve customers. To help analyze this situation, records are kept to determine how many customers will arrive in any 10-minute interval. Based on 100 tenminute intervals, the following probability distribution has been developed and random numbers assigned to each event. Number of Arrivals Probability Interval of Random Numbers Page 7 of 10 6 7 8 9 10 0.2 0.3 0.3 0.1 0.1 01-20 21-50 51-80 81-90 91-00 17. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 18, 89, and 67, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) 22 (b) 23 (c) 24 (d) 25 (e) none of the above 18. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10, inclusive. Suppose the next three random numbers were 20, 50, and 79, and these were used to simulate arrivals in the next three 10-minute intervals. How many customers would have arrived during this 30-minute time period? (a) 18 (b) 19 (c) 20 (d) 21 (e) none of the above 19. According to Table 15-2, the number of arrivals in any 10-minute period is between 6 and 10 inclusive. Suppose the next 3 random numbers were 02, 81, and 18. These numbers are used to simulate arrivals into the pharmacy. What would the average number of arrivals per 10-minute period be based on this set of occurrences? (a) 6 (b) 7 (c) 8 (d) 9 (e) none of the above Page 8 of 10 Table 15.3 A pawn shop in Arlington, Texas, has a drive-through window to better serve customers. The following tables provide information about the time between arrivals and the service times required at the window on a particularly busy day of the week. All times are in minutes. Time Between Arrivals Probability 1 2 3 4 0.1 0.3 0.4 0.2 Service Time Interval of Random Numbers 01-10 11-40 41-80 81-00 Probability Interval of Random Numbers 1 0.2 01-20 2 0.4 21-60 3 0.3 61-90 4 0.1 91-00 The first random number generated for arrivals is used to tell when the first customer arrives after opening. 20. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. If the store opens at 8:00a.m. and random numbers are used to generate arrivals, what time would the first customer arrive if the first random number were 02? (a) (b) (c) (d) (e) 8:01 8:02 8:03 8:04 none of the above Page 9 of 10 21. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first random number to generate an arrival is 39, while the first service time is generated by the random number 94. What time would the first customer finish transacting business? (a) 8:03 (b) 8:04 (c) 8:05 (d) 8:06 (e) none of the above 22. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first 3 random numbers to generate arrivals are 09, 89, and 26. What time does the third customer arrive? (a) (b) (c) (d) (e) 8:07 8:08 8:09 8:10 none of the above 23. According to Table 15-3, the time between successive arrivals is 1, 2, 3, or 4 minutes. The store opens at 8:00a.m. and random numbers are used to generate arrivals and service times. The first two random numbers for arrivals are 95 and 08. The first two random numbers for service times are 92 and 18. At what time does the second customer finish transacting business? (a) 8:07 (b) 8:08 (c) 8:09 (d) 8:10 (e) none of the above Table 15-4 Variable Value 0 1 2 3 4 Number of Runs Probability 0.08 0.23 0.32 0.28 0.09 200 Cumulative Probability 0.08 0.31 0.63 0.91 1.00 Page 10 of 10 Average Value 2.1 0 24. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is 2 or fewer? (a) 0.23 (b) 0.31 (c) 0.32 (d) 0.63 (e) none of the above 25. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, what is the probability that the number of breakdowns is more than 4? (a) (b) (c) (d) (e) 0 0.08 0.09 1.00 none of the above 26. According to Table 15-4, which presents a summary of the Monte Carlo output from a simulation of 200 runs, there are 5 possible values for the variable of concern. If this variable represents the number of machine breakdowns during a day, based on this simulation run, what is the average number of breakdowns per day? (a) 2.00 (b) 2.10 (c) 2.50 (d) 200 (e) none of the above