Question

pro - cut rotor matching certif pro - cut rotor matching certification » take exam what is roughness average? measurement used to examine the smoothness of a surface micro feet measurement used to measure thickness variation none of the above

Explanation:

Roughness average is a measure to assess surface smoothness. It quantifies the texture irregularities of a surface. Micro - feet is a unit, not the definition of roughness average. And it's not for measuring thickness variation.

Answer:

Measurement used to examine the smoothness of a surface