The wearever Shoe Company is going to open a new branch at a mall, and company manager are attempting to determine how many sales-people to hire Based on an analysis of mall traffic. The company estimates that customers will arrive at the store at the rate of 9 per hour (Poisson distributed. and from past experience at its other branches, the company knows that salespeople can serve an average of 6 customers per hour (Poisson distributed). How many salespeople should the company hire in order to mention a company policy that average a customer should have to wait for service no more than 30 of the time?