\((1)\)直线\(x+2y=0\)被曲线\({{x}^{2}}+{{y}^{2}}-6x-2y-15=0\)所截得的弦长等于_____
\((2)\)已知一组数据\(1\),\(2\),\(1\),\(0\),\(-1\),\(-2\),\(0\),\(-1\),则这组数数据的平均数为_____;方差为_______;
\((3)\)已知命题:\(p:(x-3)(x+1) > 0\),命题\(q:{{x}^{2}}-2x+1-{{m}^{2}} > 0(m > 0)\),若命题\(p\)是命题\(q\)的充分不必要条件,则实数\(m\)的范围是____________.
\((4)\)已知椭圆\(\dfrac{{{x}^{2}}}{49}+\dfrac{{{y}^{2}}}{24}=1\)上一点\(P\)与椭圆的两个焦点\(F_{1}\),\(F_{2}\)连线的夹角为直角,则\(\left| P{{F}_{1}} \right|\cdot \left| P{{F}_{2}} \right|=\)_____.