Three whole numbers are each rounded to the nearest 10. The sum of the three rounded numbers is 80. What is the maximum possible sum of the original three numbers?

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.