William is putting up signs on the edge of the road every 1/16 of a mile. he just put a sign down and he has 7/8 of a mile of road left in which to place his signs. he wants to determine how many more signs he should put on the edge of the road. william should put up more signs.

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.