The available packages of pencils at a store contain the following number of pencils: 12, 8, 24, 10, 36, 30, 48, 24, 50, 60, 72, 40. Compare the mean and median when a pack of 4 pencils and a pack of 100 pencils are added. The mean and median increase. The mean increases; the median does not change. The median increases; the mean does not change. The mean and median do not change