Mario ran 12 kilometers. One mile is approximately equal to 1.6 kilometers. How many miles did Mario run? (I'm new, I don't know why it says High School)

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.