The waiting time before service in a bank is exponentially distributed with a mean waiting time of 5 minutes. a. What is the median waiting time. b. You enter the bank and find that your friend has been waiting in the queue for service for past 2 minutes. Upon your arrival what is the probability that your friend will wait for another 4 minutes? c. What is the mean and variance of the waiting time in the bank?

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The waiting time before service in a bank is exponentially distributed
with a mean waiting time of 5 minutes.
a. What is the median waiting time.
b. You enter the bank and find that your friend has been waiting in the
queue for service for past 2 minutes. Upon your arrival what is the
probability that your friend will wait for another 4 minutes?
c. What is the mean and variance of the waiting time in the bank?

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