The perimeter of a rectangular swimming pool is 30 meters the width of the pool is 3 meters less than its length find the width of the swimming pool

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.