Last year kent bought a mountain bike for $460. his bike has depreciated since bought it last year. it is now worth $320. what percent did the value of kent bike depreciate over the past year to the nearest whole percent.

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.