The owner of a small deli is trying to decide whether to discontinue selling magazines. He suspects that only 9.1% of his customers buy a magazine and he 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 will keep track of the number of customers that buy a magazine. Assuming his suspicion that 9.1% of his customers buy a magazine is correct, what is the probability that exactly 6 out of the first 10 customers buy a magazine?

Please show formula.