The median is 138. First you arrange the numbers in order: 100,103,115,119,120,126,126,129,137,139,140,143,148,152,154,154,165,165. Next you find the middle of the set of number, which is 137 and 139. Next, you need to find the middle of those number, so add 137 and 139 to get 276. Finally you divide them by 2 to get 138.
