A carpenter sands 1
2
of a dresser in
3
4
hour. At this rate, how long does it take the carpenter to sand
1
dresser?

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.