题干

某数学老师为了了解学生在数学学习中常见错误的纠正情况,收集整理了学生在作业和考试中的常见错误,编制了10道选择题,每题3分,对他所教的初三(1)班(2)班进行了检测.如图表示从两班各随机抽取的10名学生的得分情况:

(1)利用图中提供的信息,补全下表:

班级

平均数(分)

中位数(分)

众数(分)

(1)班


24


(2)班

   24


    21

(2)若把24分以上(含24分)记为”优秀”,两班各50名学生,请估计两班各有多少名学生成绩优秀;

(3)观察图中数据分布情况,请通过计算说明哪个班的学生纠错的得分情况更稳定.

上一题 下一题 0.0难度 选择题 更新时间:2018-07-26 10:46:26

答案(点此获取答案解析)

解:(1)(1)班平均分:10
1
(24+21+27+24+21+27+21+24+27+24)=24;有4名学生24分,最多,故众数为24分;(2)班处于中间位置的数为24和24,故中位数为24,出现次数最多的数为24,故众数为24.

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