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【简答题】
某校抽查了50名九年级学生对艾滋病三种主要传播途径的知晓情况，结果如下表．根据这些数据，估计该校九年级550学生中，知道三种传播途径的约有______人． 传播途径（种） 0 1 2 3 知晓人数（人） 3 7 15 25
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