Which of the following statements is not true? a. The median is not affected by outliers as much as the mean. b. The mode is the most frequently occuring value(s) in a data set. c. The best measure of central tendency depends on the data set. d. The mean is the middle value of a data set.

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.