The lifetime of these tires follows an exponential distribution. The exponential distribution is often concerned with the amount of time until some specific event occurs. For example, the amount of time (beginning now) until an earthquake occurs has an exponential distribution. Other examples include the length, in minutes, of long-distance business telephone calls and the amount of time, in months, a car battery lasts. It can also be used to model the time spent by a postal clerk with a custome