16．已知一组样本数据x1x_{1}x1，x2x_{2}x2，x3x_{3}x3，…\ldots…，x10(x1<x2<x3<…<x10)x_{10}(x_{1}<x_{2}<x_{3}<\ldots <x_{10})x10(x1<x2<x3<…<x10)中，x5x_{5}x5与样本平均数相等，x6=0x_{6}=0x6=0．则去掉以下哪个数据以后，新的样本数据的方差一定比的来的样本数据的方差小？((( )))