In an ordinary 8hour day FreetheClogcom plumbing receives calls for emergency service at an average rate of 075 per hour otherwise the calls appear to be random and independent The owner currently has a crew of technicians capable of handling up to and including nine emergencies per day She is considering expanding the crew If she wants to ensure that there is less than a 5 chance that the crew wont be able to handle the emergency load she will need a crew that can handle up to and including em