The surface roughness profile for a surface is given as y = 10 + 5 sin x, where ‘x’ is in mm and ‘y’ is in μm. The centre line average roughness R_a is ________ μm.

Enter numerical value using the virtual keypad. Round off where necessary.

The surface roughness profile for a surface is given as y = 10 + 5 sin x, where ‘x’ is in mm and ‘y’ is in μm. The centre line average roughness Ra is ________ μm.