Buses arrive at the downtown bus stop and leave for themall stop. Past experience indicates that 20% of the time,the interval between buses is 20 minutes; 40% of the time,the interval is 40 minutes; and 40% of the time, the intervalis 2 hours. If I have just arrived at the downtown bus stop,how long, on the average, should I expect to wait for a bus?

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter12: Queueing Models
Section12.5: Analytic Steady-state Queueing Models
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Buses arrive at the downtown bus stop and leave for the
mall stop. Past experience indicates that 20% of the time,
the interval between buses is 20 minutes; 40% of the time,
the interval is 40 minutes; and 40% of the time, the interval
is 2 hours. If I have just arrived at the downtown bus stop,
how long, on the average, should I expect to wait for a bus?

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