quick的副词形式:Math!!!!Math~~~~~
来源:百度文库 编辑:高考问答 时间:2024/05/23 00:33:54
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