A data set consists of the following five numbers: 5, 6, 7, 8, 9. A new number, 20, is added to this data set. Which statement best describes the effect of adding 20 on the mean and median of the data set?
Both the mean and the median increase.
The mean increases, and the median decreases.
The mean decreases, and the median increases.
Both the mean and the median decrease.
