Truck Salesman A Used Truck Salesman in a Small Town States That,on

Short Answer

Truck Salesman
A used truck salesman in a small town states that,on the average,it takes him 5 days to sell a truck.Assume that the probability distribution of the length of time between sales is exponentially distributed. ​ ​
-{Truck Salesman Narrative} What is the probability that he will have to wait at least 8 days before making another sale?