A Call Center Receives Calls from Customers at a Rate

question 87

Short Answer

A call center receives calls from customers at a rate of 2 per min.The time between customer calls follows an exponential distribution.
(a)What is the probability that it takes 1/3 of a minute or less between consecutive customer calls?
(b)What is the probability that it takes 1/2 of a minute or more between consecutive customer calls?