battery manufacturers compete on the basis of the amount of time their products last in cameras and toys. A manufacture of alkaline batteries has observed that it's batteries last for an average of 26 hours when used in a toy racing car. The amount of time is normally distributed with a standard deviation of 2.5 hours.  What is the probability that the battery last between 24 and 28 hours? What is the probability that the battery last longer than 28 hours? What is the probability that the battery lasts less than 24 hours?