a) The graph could be misleading if the vertical axis is not labeled or scaled properly. If the scale is too small or too large, it could make small differences in rainfall appear larger or smaller than they actually are.
b) To make the graph less misleading, the vertical axis could be labeled with the actual values of rainfall in inches and the scale could be adjusted accordingly. For example, the scale could start at 3.5 and increase by 0.1 until ending at 4.6. Additionally, the line segments connecting the data points could be thicker and more visible to make it clear that they represent individual measurements and not a continuous trend. Finally, a title or caption could be added to clarify the purpose of the graph and the time period that the data covers.