Atennis racket at sport city costs $180 and is discounted 15%. the same model racket costs $200 at tennis world and is on sale for 20% off. which store is offering the better deal? explain:

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.