This question falls under Measurement and Analysis , which includes understanding and interpreting data to inform decision-making. To find the median , the numbers must first be arranged in ascending order: 13, 13, 13, 13, 14, 14, 16, 18, 21. Since there are 9 values (an odd number) , the median is the middle (5th) value , which is 14 . The median is a key statistical measure used in patient experience data analysis because it is less affected by extreme values (outliers) compared to the mean. In CPXP practice, using the median helps provide a more accurate representation of central tendency in skewed data sets, such as survey responses or wait times. This supports better insights and more reliable decision-making in improving patient experience outcomes.