Why is 0.3 a rational number a. it is on the number line. b. the number can be written as a ratio of two integers. c. it is a decimal. d. the numbers can not be written as a ratio of two integers.

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.