12.某集团生产了一·种新型电子元件现从中随机抽取200个进行寿�试验得到�率分布直方图如下图所示估计寿�在100 400小时的概率 Template




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tomski12.某集团生产了一·种新型电子元件现从中随机抽取200个进行寿�试验得到�率分布直方图如下图所示估计寿�在100 400小时的概率 coloring