从骰子热身到中心极限定理:大量独立小因素相加为何涌现钟形;身高、成绩、零件误差三大生活实例;什么不会长成钟(单骰子/二分次数/彩票);Box-Muller 与 12 均匀数相加两种造钟算法。
Why do heights, exam scores and part errors form bells? Many small independent factors add up — CLT. What never grows a bell (single die, halving tree, lottery), plus two normal-generator recipes.