Sara divides 1125 by 9. her answer is 125. what is the best way to check sara's answer? a) 125 x 9 b) 1125 x 9 c) 1125 9 d) 1125 125

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.