Quiz 9
Name: ________________________________
November 13, 2009
An operator receives an average of 5 calls per minute.
The time between calls follows an
exponential distribution.
Let C be the time the operator waits for the next call.
a.
What is the probability the operator waits exactly 15 seconds for the next call?
b.
What is the probability the operator waits at least 15 seconds for the next call?
=
c.
Given the operator has been waiting 15 seconds and still hasn’t received the next call,
what is the probability the operator will have to wait more than 25 seconds total?
=
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Quiz 9
Name: ________________________________
November 13, 2009
The time a customer service desk receives the next complaint follows an exponential distribution
with a mean of 10 minutes.
Let C be the time until the service desk receives its next complaint.
a.
Name the distribution and parameters of C.
b.
What is the probability the service desk waits more than 7 minutes for the next
complaint?
c.
Given it has been 7 minutes and there has not been a new complaint, what is the
probability the next complaint will come sometime after 15 minutes total?
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 Fall '08
 MARTIN
 Probability, Probability theory

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