Example 173
The time between hits to a certain website is an exponential distribution with an average of 5 minutes between hits.
a) What is the probability that there are no hits in a 20-minute period?
b) What is the probability that the first observed hit occurs between 15 and 20 minutes?
c) Given that there are no hits in the first 5 minutes observed, what is the probability that there are no hits in the next 15
tes?
20
20