Swifty Distribution markets CDs of the performing artist Unique. At the beginning of October, Swifty had in beginning inventory 2,000 of Unique’s CDs with a unit cost of $7. During October, Swifty made the following purchases of Unique’s CDs.

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.