Suppose that the average time a fully charged 6-volt lap- top battery will operate a computer is 3.2 hours and follows the exponential probability distribution. a. Determine the probability that the next charge will last 1. less than 2 hours. 2. between 2.5 and 4.0 hours. 3. more than 3.5 hours. b. Confirm the answers to part a using Excel.