Gary saved dimes and nickels at a ratio of 5:7. Then, he saved
20% more dimes and 3 times the original number of nickels. If
he had 540 dimes and nickels altogether in the end, how many
more dimes than nickels did he have?

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.