Concept explainers
a
Interpretation:Proportion of bulb lasting more than 2 years is to be calculated.
Concept Introduction:
Mean is the average value of the data given. It is usually the middle value which represents the whole data. It is calculated by summing up all values divided by number of values.
b
Interpretation:Probability that a bulb chosen fails in first-three months of operation is to be determined.
Concept Introduction:
Mean is the average value of the data given. It is usually the middle value which represents the whole data. It is calculated by summing up all values divided by umber of values.
c
Interpretation:Probability that a bulb lasted for 10 years fails in next three months is to be determined.
Concept Introduction:
Mean is the average value of the data given. It is usually the middle value which represents the whole data. It is calculated by summing up all values divided by umber of values.
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Production and Operations Analysis, Seventh Edition
- In designing a new space vehicle, NASA needs to decide whether to provide 0, 1 or 2 backup systems for a critical component of the vehicle. The first backup system, if included, comes into use only if the original system fails. The second backup system, if included, comes into use only if the original system and the first backup system both fail. NASA engineers claim that each system, independent of the others, has a 1.5% chance of failing if called into use. Each backup system costs $70,000 to produce and install within the vehicle. Once the vehicle is in flight, the mission will be scrubbed (ended early) only if the original system and all backups fail. The cost of a scrubbed mission, in addition to production costs, is assessed to be $5,000,000. How many backup systems are needed to minimize NASA’s expected total cost?arrow_forwardRepresent the situation as a Markov chain. Determine the probability that the professor will purchase the current model (M1, M2, M3) in 4 years.arrow_forwardThe length of time between breakdowns of an essential piece of equipment is important in the decision of the use of auxiliary equipment. An engineer thinks that the best “model” for time between breakdowns of a generator is the exponential distribution with a mean of 15 days. If the generator has just broken down, what is the probability that it will break down in the next 12 to 24 days?arrow_forward
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- Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,