The graph clearly shows that an increase is study time results in a higher grade. However, it also shows that studying less than two hours does little to help the grade received. Likewise, studying more than five hours will not increase the grade significantly either. Obviously, this is a very small sample of data and we should be very careful about any conclusions we draw.
Besides showing the relationship between study time and grade received for an imaginary chemistry class, the graph demonstrates many good graphing practices.