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某调查机构对本市小学生课业负担情况进行了调查,设平均每人每天做作业的时间为x分钟...
某调查机构对本市小学生课业负担情况进行了调查,设平均每人每天做作业的时间为x分钟.有1000名小学生参加了此项调查,调查所得数据用程序框图处理,若输出的结果是680,则平均每天做作业的时间在0~60分钟内的学生的频率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909742580691/SYS201311030959097425806006_ST/images0.png)
A.680
B.320
C.0.68
D.0.32
考点分析:
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