distribution curve
Mathematical term for a curve representing a statistical distribution, such as a normal distribution curve.
This distribution curve shows a normal distribution.
Draw a distribution curve from the data.
分布 means 'distribution' in general; 分布曲線 specifically refers to the graphical curve representing that distribution.
曲線 means 'curve' in a broad sense; 分布曲線 is a compound specifically for a statistical distribution curve.
Compound of 分布 (distribution) and 曲線 (curve), directly corresponding to the English term 'distribution curve'.