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南京中考中的统计与概率问题

  • 2026-03-24 19:06:41
南京中考中的统计与概率问题

关注新课标的要求

《义务教育数学课程标准(2022 年版)》对初中 “统计与概率” 的要求,聚焦抽样与数据分析随机事件的概率两大主题,核心是发展数据观念与随机观念。

一、抽样与数据分析

  1. 抽样与数据收集

  2. 体会抽样的必要性,通过实例了解简单随机抽样。

  3. 经历收集、整理、描述、分析数据的全过程,能用计算器处理复杂数据。

  4. 数据描述与可视化

  5. 会制作扇形统计图,能用条形、折线、扇形、频数分布直方图等直观描述数据。

  6. 了解频数、频数分布的意义,能画频数分布直方图,解释数据分布特征。

  7. 数据特征分析(集中趋势)

  8. 理解平均数、中位数、众数的意义,能计算中位数、众数、加权平均数,知道它们描述数据集中趋势。

  9. 数据特征分析(离散程度)

  10. 体会刻画数据离散程度的意义,会计算简单数据的离差平方和、方差。

  11. 数据分类与进阶分析(新增)

  12. 经历数据分类活动,知道按组内离差平方和最小原则分类的方法。

  13. 了解四分位数,知道四分位数与箱线图的关系,能借助箱线图分析数据分布。

  14. 统计推断

  15. 能用样本的平均数、方差估计总体的平均数、方差,根据统计结果作出合理判断与预测。

二、随机事件的概率

  1. 概率概念与计算

  2. 能通过列表、画树状图列出简单随机事件所有可能结果,计算等可能事件的概率。

  3. 了解概率的意义,知道概率是对随机事件发生可能性大小的定量刻画。

  4. 频率与概率的关系

  5. 知道大量重复试验时,频率可估计概率,体会频率的稳定性。

  6. 随机观念

  7. 区分确定性现象与随机现象,初步形成随机观念,能用概率知识解释生活中的随机现象。

三、学业要求(核心素养导向)

  • 能根据实际问题设计简单的抽样调查方案,收集、整理、描述数据,选择合适的统计量分析数据。

  • 能解释统计结果,根据结果作出简单判断和预测,并进行交流。

  • 能计算简单等可能事件的概率,用频率估计概率,解决实际问题。

  • 发展数据观念和随机观念,形成尊重数据、实事求是的科学态度。

四、新老教材对比

1. 内容整合:原九年级下册统计概率全部前移到八下、九上,不再单独设章

2. 新增重点:四分位数和箱线图、统计案例、概率应用、综合与实践

这里,卜老师把新版人教版八下中的《数据的四分位数》给大家参考——

新人教版八下数学教材24.3节

3. 结构更顺:核心知识 + 应用案例同步学习,更符合新课标要求。

新老教材中关于“统计与概率”领域的对比图如下:

※颜色说明:

红色:新增内容(新教材首次出现)

橙色:调整/整合内容(章节拆分、合并或表述优化)

绿色:保留内容(新旧教材核心知识点一致)

老苏科版教材中的统计与概率

从“统计与概率”的学科难度和以往的南京市中考真题来看,“统计与概率”每年占据中考试卷的18分左右,属于典型的难度不大的必考题。学有余力的同学,完全可以在自主学习的基础上去探究一下历年的中考真题。虽然九年级的新书还没下来,但是有老教材作为参考,卜老师把老教材中的“数据的集中趋势和离散程度”、“等可能条件下的概率”放在这里,供同学们自主学习之用。相信同学们在学完八下的“数据的收集、整理与描述”、“认识概率”后,可以发扬“自我导向的学习者”的精神,顺利完成“统计与概率”的预习。

2012苏科版九上教材第3章

2012苏科版九上教材第4章

南京中考中的统计与概率

为了方便同学们感受中考中“统计与概率”的考题形式和难度,卜老师把2008年~2025年的南京中考真题进行了简单梳理,同学们可以踹一踹(have a try)。

2008~2025南京中考试题集锦

漫游人类星球 寻找美好事物

长按二维码 成为知青农场的常驻居民吧~

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001537s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.017581s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002662s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001469s ]
  6. SELECT * FROM `set` [ RunTime:0.000641s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001573s ]
  8. SELECT * FROM `article` WHERE `id` = 509799 LIMIT 1 [ RunTime:0.001032s ]
  9. UPDATE `article` SET `lasttime` = 1774438422 WHERE `id` = 509799 [ RunTime:0.042517s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009452s ]
  11. SELECT * FROM `article` WHERE `id` < 509799 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001313s ]
  12. SELECT * FROM `article` WHERE `id` > 509799 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002185s ]
  13. SELECT * FROM `article` WHERE `id` < 509799 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000730s ]
  14. SELECT * FROM `article` WHERE `id` < 509799 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000739s ]
  15. SELECT * FROM `article` WHERE `id` < 509799 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000841s ]
0.179368s