You chose that the ions are drawn. However, if concentration is the sole factor being considered, there is neither a push nor an attraction between the ions. The ions simply make random movements and, thus, since more are outside that might move in than inside to move out, more ions on average will move in. Examine Figure 1 and 2 from earlier in the tutorial to check your answers.
Figures 1 and 2 reshown here to illustrate diffusion.