Editor > Add > Percentile Lines
Choose to display percentile lines. By default, Minitab displays labels for each percentile line.
Customize a percentile line using scale editing.
Show percentile lines at Y values: Type the y-scale values, either in percent, probability, or score, for displaying the percentile line. When you enter a y-scale value, its corresponding data value is automatically calculated and displayed. Separate multiple entries with a space.
Show percentile lines at data values: Type the data values for displaying the percentile line. When you enter a data value, its corresponding y-scale value is automatically calculated and displayed. Separate multiple entries with a space.