the total cost to go to the Glow arena is x dollars per hour plus 3 dollar fee for a glow necklace. write an expression to represent the cost, for 5 people to go to the glow arena for 4 hours

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.