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数据:15,17,14,10,15,17,17,16,14,12的中位数为 ,众数为
(1)1,2,3,4,5,6,7,8,9;
(2)11,12,13,14,15,16,17,18,19;
(3)10,20,30,40,50,60,70,80,90.
并分析由这些结果可得出什么一般性结论.