Data is mainly right skewed. In simpler terms the data has more if a "tail" on the right side while most of the data is on the left. If you were to trace a line over each last dot (the one's at the top) all the way to the last point. You would see that it does not make a "bell-shape" but more of the shape of an arrow pointing left. If it were symmetrical it would have more of a balanced amount of data points on it's opposite side which would make the shape either look like a triangle or a bell shape. Hope that helps.
