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（本题13分） “你低碳了吗？”这是某市为倡导建设节约型社会而发布的公益广告里的一句话．活动组织者为了了解这则广告的宣传效果，随机抽取了120名年龄在[10，20) ，[20，30) ，…， [50，60) 的市民进行问卷调查，由此得到的样本的频率分布直方图如图所示． (1) 根据直方图填写右面频率分布统计表； (2) 根据直方图，试估计受访市民年龄的中位数（保留整数）； (3) 按分层抽样的方法在受访市民中抽取 名市民作为本次活动的获奖者，若在[10，20)的年龄组中随机抽取了6人，则 的值为多少？
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