https://blog.csdn.net/ccnt_2012/article/details/81114920
http://www.ruanyifeng.com/blog/2015/06/poisson-distribution.html
如何通俗理解泊松分布？
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https://blog.csdn.net/ccnt_2012/article/details/81114920
http://www.ruanyifeng.com/blog/2015/06/poisson-distribution.html
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