史上最难游戏2攻略:Math!!!!Math~~~~~

来源：百度文库 编辑：神马品牌网 时间：2024/05/16 11:08:41
The average of P number is x and the average of N number is y. What is the average of all the (P+N) number?

x+y

(P*x+N*y)/(x+y)

(P+N)*xy /(Py+Nx)

(P*X+N*Y)/(P+N)
加权平均数

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