when is the jack line used in graphs????
The term you are referring is the "jagged line" or a "kink".
It is a zig-zag line placed near origin to show the continuity of the graph.
In order to better understand the concept, consider the example given below.
Example:
The given tally table represents the total runs scored by 39 batsmen in 10 different test matches.
Runs | Tally marks | Frequency (Number of batsmen) |
150 – 200 |
| 5 |
200 – 250 |
| 4 |
250 – 300 |
| 5 |
300 – 350 |
| 7 |
350 – 400 |
| 5 |
400 – 450 |
| 6 |
450 – 500 |
| 7 |
We want to draw a histogram for the above given distribution table.
Since in the given question there is no entry from 0 to 150 along the x-axis. So, we will use kink to indicate that the values between 0 – 150 are not represented and hence histogram can be plotted as follows:
Hope now the concept will be clear to you.