When dealing with standard deviation (SD), it represents the average amount of variation or dispersion in a set of data points. Specifically, if your SD is 5, it means that the spread of your data points around the mean is approximately 5 units.
Now, regarding error bars on a graph, they typically represent the variability or uncertainty in the data. Error bars usually extend above and below each plotted point to show the range of possible values.
In your case, if the SD is 5, error bars would typically be drawn at +/- 5 units from each plotted point to represent the variability in the data. However, it's essential to note that error bar length can depend on the context and the specific conventions or standards being followed.