Hi Prithvee,
Head back to the data table, right click on the column corresponding to your x-axis variable and select Label/Unlabel. (You can also find the Label/Unlabel command under the Cols menu.) This will tell JMP to display this column's values in any hover labels in graphs. The column should now have a yellow tag icon next to it in the data table's columns pane, and you should now see the corresponding values in the hover label in your variability chart.
Ross
Ross Metusalem
JMP Academic Ambassador