mean

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The values of the roughness Ra represented on both graphics, correspond to the arithmetical average of the parameter roughness Ra measured along G1, G2, G3 and G4 for each test.
Plastic powder particles over 5 mm are plate-shaped and their aspect and roundness are calculated as the arithmetical average of two images (flatwise and alongside).
A1, however a median rather than an arithmetical average measure of wages is likely to be more representative.