The major problem with battery powered cars is the limited time they can be driven before the batteries must be recharged. StuckPedal Motors has developed a battery pack that will power a car at a sustained speed of 45 miles per hour for an average of 8 hours with a standard deviation of 0.4 hours.What is the likelihood that 10 randomly chosen cars equipped with the StuckPedal battery pack will be able to travel at 45 miles per hour for more than 8.4 hours?