Lurinda ordered some boxes of greeting cards online. the cost of the cards is $6.50n plus $3 where n is the number of boxes and $3 is the shipping and handling charge. how much will lurinda pay if she orders 8 boxes of cards?

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.