Class number Mid-value of class [mm] Class spread [mm] 1 0.062 0.125 2 0.187 0.125 3 0.312 0.125 4 0.437 0.125 5 0.562 0.125 6 0.687 0.125 7 0.812 0.125 8 0.937 0.125 9 1.062 0.125 10 1.187 0.125 11 1.375 0.250 12 1.625 0.250 13 1.875 0.250 14 2.125 0.250 15 2.375 0.250 16 2.750 0.500 17 3.250 0.500 18 3.750 0.500 19 4.250 0.500 20 4.750 0.500 21 5.500 1.000 22 6.500 1.000 23 7.500 1.000 24 8.500 1.000 25 9.500 1.000 26 11.000 2.000 27 13.000 2.000 28 15.000 2.000 29 17.000 2.000 30 19.000 2.000 31 21.500 3.000 32 24.500 3.000 |
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