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THA Galton pyramid (or Galton board) illustrates the Normal distribution by showing how many small random events combine to create a predictable bell-shaped pattern. As balls drop through rows of pegs, each bounce sends a ball left or right with equal probability. Although each individual path is random, most balls end up near the center because there are many more ways to take a balanced mix of left and right bounces than to take all left or all right. When many balls are dropped, the pile that forms in the bins at the bottom naturally takes on the smooth, symmetric curve of the Normal distribution, demonstrating how repeated small random variations tend to produce a bell curve.
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