Select project lines > Editor > Edit Bars > Binning
Use to change histogram bin interval type, number, and position.
Interval Type
Midpoint: Choose to define bin intervals by midpoints.
Cutpoint: Choose to define bin intervals by cutpoints.
Interval Definition
Automatic: Choose to accept the default number of bins.
Number of intervals: Choose and enter the number of bins. In some cases, Minitab may use fewer bins than the number you enter in order to make logical bin boundaries.
Midpoint/Cutpoint positions: Choose and enter custom midpoint or cutpoint positions.