Work out the median for each group of numbers.
3, 5, 7, 7, 8, 10, 11, 11, 14
10, 11, 13, 14, 16, 18, 20, 20
3, 4, 6, 6, 6, 7, 8, 9, 10
41, 43, 44, 46, 48, 49, 50, 50, 53, 54