Justine took samples of the numbers of points scored by two football teams during their games. The data for the samples are shown below.
Cougars: 13, 21, 3, 9, 7, 10, 28, 21
Hawks: 28, 10, 16, 17, 28, 20, 14, 35
How much greater is the mean number of points scored by the Hawks than the mean number of points scored by the Cougars?