The Owner of a Small Convenience Store Is Trying to Decide

Essay

The owner of a small convenience store is trying to decide whether to discontinue selling magazines. He suspects that only
5% of the customers buy a magazine and thinks that he might be able to use the display space to sell something more
profitable. Before making a final decision he decides that for one day he'll keep track of the number of customers and
whether or not they buy a magazine.
-What is the probability that he does not sell a magazine until the 8th customer? Show
work.