"A generator manufacturer found that the smallest, least expensive generator that they manufacture lasts, on average, 2000 hours with a standard deviation of 150 hours. At least what percent of the generators last between 1550 and 2450 hours?" 1. What is the mean? :l hours (Click to view hint) 2. What is the standard deviation? 3. 1550 Is El standard deviations |:l the mean and 2450 is |:| standard deviations :l the mean. (Click to view hint)