Find the elapsed time. start time: 11: 30 a. m. end time: 12: 20 p. m. elapsed time: [1] minutes

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.