Question

Is it mandatory to use the kink or jagged line only in histogram? Can I use it on a bar graph? Also can I use it on Y Axis of histogram and bar graph?

Answer 1

No, its not mandatory. Jagged lines are used to show a break in both X or Y axis.
So, yes, you can used it in both X and Y axis, and also in any forms of graphs like histograms, bar graphs etc.

Consider that your graphs have values from 50 to 100.
It is difficult to mark all values from 0 to 100 when you only need from 50 to 100. So .You can put a jagged line from 0 to 40, as they are not needed. You can used in both X and Y axis and in all graphs.