对容量为n的样本,求概率密度f(x,a)=2(a-x)/a^2,o

Question

对容量为n的样本,求概率密度f(x,a)=2(a-x)/a^2,o

Answer 1

E(X)=∫(0~a)2(a-x)x/a^2 dx
=(ax^2-(2/3)x^3)/a^2|(0~a)
=a/3
a/3=Xbar
a=3Xbar