The cumulative frequency-curve is a valuable and commonly used statistical curve, but is difficult to interpret except comparatively. To facilitate interpretation of an empirical cumulative curve, a theoretical curve of perfect grade-size distribution can be superimposed by: (a) drawing on logarithmic probability paper a straight line between points representing the maximum and minimum grade sizes of the sample, (b) transferring this line to the semilogarithmic paper upon which the empirical data are also plotted.

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