[header] How to use the empirical rule [title] Draw out and divide a bell curve. [step] Sketch out a normal curve, where the highest point is in the middle, and the ends slope down and taper off symmetrically to the left and right. Next, draw several vertical lines intersecting the curve : [substeps] 1 line should divide the curve in half. 
Draw 3 lines to the right of this middle line, and 3 more to the left. These should divide each of the curve's halves into 3 evenly spaced sections and one tiny section at the tip.