解???$：(1)$???這???$10$???座名山 “身高” 在???$ 1000 \mathrm{m} $???到???$ 2000 \mathrm{m} $???之間的頻數(shù)為???$ 6 ；$???
???$(2)$???這???$10$???座名山 “身高” 從高到低排列為:
???$286.3、$??????$1300.2、$??????$1473.4、$??????$1491.7、$??????$1532.7、$??????$1612.1、$???
???$1864.8、$??????$2016.1、$??????$2154.9、$??????$3079.3，$???
其中位于第???$ 5 、$??????$ 6 $???位的平均數(shù)為???$： (1532.7+1612.1) \div 2=1572.4 ， $???
則中位數(shù)為???$ 1572.4 .$???
???$(3)\frac{1}{5}(1532.7+2154.9+1300.2+2016.1 +1491.7)=1699.12(\mathrm{m})$???
答: “五岳” 的平均 “身高” 為???$ 1699.12\ \mathrm {m} .$???
