Ryan bought some candy for Valentine's Day. Each piece of candy that Ryan buys costs $0.75 and then table below shows the cost of 0, 5, 10, 20 and 30 pieces of candy.​

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.