WITH EXCEL FORMULA 2 8 percent of all customers who enter a store will make a purchase. Suppose that 6 customers enter the store and that these customers make independent purchase decisions. Required: a ) Calculate the probability that exactly five customers make a purchase. b ) Calculate the probability that at least three customers make a purchase. c ) Calculate the probability that two or fewer customers make a purchase. d ) Calculate the probability that at least one customer makes a purchase. e ) Calculate the expected number of customers that make a purchase