9.
\((1)\)十进制数\(23\)转化为二进制数为________.
\((2)\)从甲、乙、丙、丁四人中选\(3\)人当代表,则甲被选上的概率为________.
\((3)\)设实数\(x\),\(y\)满足\(\begin{cases} & x-y-2\leqslant 0 \\ & x+2y-5\geqslant 0, \\ & y-2\leqslant 0 \\ \end{cases}\),则\(z=\dfrac{y}{x}\)的取值范围是________.
\((4)\)点\((0,2)\)关于直线\(l\):\(x+y-1=0\)的对称点的坐标为________.
\((5)\)已知某\(8\)个数据的平均数为\(5\),方差为\(3\),现又加入一个新数据\(5\),此时这\(9\)个数据的方差为________.