设x1,x2,x3为总体x的样本,t=1/2*x1+1/6*x2+k*x3,已知t是x的无偏估计,则k=

Question

设x1,x2,x3为总体x的样本,t=1/2*x1+1/6*x2+k*x3,已知t是x的无偏估计,则k=

Answer 1

1/3有总样本了,各个系数和为1