Final answer:
The range of plotted points on a graph is not always continuous. It depends if the data represented is continuous or discrete, as seen in examples like continuous probability distributions and measured physical data.
Step-by-step explanation:
The range of plotted points on a graph is not always continuous. In the context of Two-Dimensional (x-y) Graphing, a graph can represent both continuous data and discrete data. For example, the graph of a continuous probability distribution shows a continuous curve representing the probability density function. However, when plotting physical data, such as that derived from quadratic equations, the points represent specific, measurable events, and the graph may only contain meaningful data above the x-axis, or for positive value roots. Moreover, topographic maps can have lines that indicate isolines which are constant slope lines, these may not form a continuous curve but a series of discrete lines.