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<br/><b>Specification:</b><br/>Item Type: Probability Demonstrator<br>Material: ABS<br>Introduction:<br>Place a small round glass ball with a diameter slightly smaller than the distance between two nails at the entrance. As the ball descends, it rolls left or right with a probability of 1/2 after hitting a nail, and then touches the below layer of nail. Continue like this until rolling into the grid on the base plate. Countless small balls of the same size continuously fall from the entrance, and as long as there are a considerable number of balls, they will  on the bottom plate to form a density function diagram that approximates a normal distribution i.e. a symmetrical ancient bell shape, high in the middle and low at both ends, where n is the number of layers of nails.<br> <br/><br/><b>Package List:</b><br/><p>1 x Probability Demonstrator</p><p>1 x User Manual</p> <br/>