Use the unit rate of $2.09 per pound to find the cost of 8.5 pounds of grapes. [type your answer as a number and round to the nearest cent.] 8.5 pounds of grapes = $

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.