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分布
指数分布
随机事件的间隔事件符合指数分布。lamda 单位事件发生事件的个数。
每分钟发生lam个事件。3分钟后发生一次事件的概率 = lam*exp(-lam*3) 用PDF来算

如果问3分钟内发生一次事件的概率 = 1 - exp(-lam *3), 用CDF 来算
泊松分布

单位时间内随机事件发生的次数的概率分布。λ是单位时间(或单位面积)内随机事件的平均发生的概率
投球入篮的概率为 λ个每分钟。5分钟（TBC）
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