问题描述:
我市自实施新课程改革后,学生的自主学习、合作交流能力有很大提高.张老师为了了解所教班级学生自主学习、合作交流的具体情况,对本班部分学生进行了为期半个月的跟踪调查,将调查结果分成四类:A-特别好、B-好、C-一般、D-较差,并将调查结果绘制成两幅不完整的统计图,请你根据统计图解答下列问题:(1)本次调查中,张老师一共调查了______名同学;(2)将上面的条形统计图补充完整;(3)求左图中八个数字的中位数和众数. |
考点提示:条形图
最佳答案:
(1)(1+2)÷15%=20人;(2)C组人数为:20×25%=5人,所以,女生人数为5-3=2人,D组人数为:20×(1-15%-50%-25%)=20×10%=2人,所以,男生人数为2-1=1人,补全统计图如图:(3)男生共9人,中位数为第5人的调查情况,故为B,众数为B;女生共11人,中位数为第6人的调查情况,故为B,众数为B; |
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