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【简答题】
某校为了了解八年级学生的体能情况，抽调了一部分学生进行一分钟跳绳测试。将测试成绩整理后作出如下的条形统计图。已知跳绳次数不少于100次的同学占96％，从左到右第二组有12人，第一、二、三、四组的人数之比为2：4：17：15，如果这次测试的中位数是120次，那么这次测试中成绩为120次的学生至少有（     ）人。(注：每组含最小值，不含最大值)
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