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People arrive at a newspaper stand with an interarrival time that is exponentially distributed with a mean of 0.5 minute. Fifty-five percent of the people buy just the morning paper, 25% buy the morning paper and a Wall Street Journal. The remainder buy only the Walt Street Journal. One clerk handles the Wall Street Journal […]

 

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Orders are received for one of four types of parts. The interarrival time between orders is exponentially distributed with a mean of 10 minutes. The table that follows shows the proportion of the parts by type and the time to fill each type of order by the single clerk. Orders of types A and B […]

 

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A building-materials firm loads trucks with two pay loader tractors. The distribution of truck-loading times has been found to be exponential with a mean loading_ time of 6 minutes. The truck interarrival time is exponentially distributed with an arrival rate of 16 per hour. The waiting time of a truck and driver is estimated to […]

 

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Three independent widget-producing machines all require the same type of vital part, which needs frequent maintenance. To increase production, it is decided to keep two spare parts on hand (for a total of 2 + 3 = 5 parts). After 2 hours of use, the part is removed from the machine and taken to a […]

 

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