📚 Year 7 AQA Statistics: Unit Test Mock Paper Walkthrough | 七年级AQA统计：单元测试模拟卷解析
This article walks you through a full mock paper for the Year 7 AQA Statistics unit test. Each question is broken down step by step, showing you exactly how to pick up every mark. Whether you are revising tally charts, averages or data representation, this detailed walkthrough will strengthen your understanding and boost your confidence.
本文为你详细解析一份针对七年级AQA统计单元测试的完整模拟试卷。每道题目都会逐步拆解，展示如何拿到每一分。无论你正在复习计数表、平均数还是数据表示，这篇精细解析都将加深你的理解并提升你的信心。
The paper below contains five questions worth 40 marks in total, with a suggested working time of 30 minutes. Every question has a full solution, a list of the marks that are awarded, and a note on the mistakes that cost students the most marks year after year.
下面的试卷共五道题，满分40分，建议用时30分钟。每道题都配有完整解答、明确的得分点说明，以及历年最容易让学生失分的错误提醒。
1. Mock Paper Overview | 模拟试卷概览
This mock paper is designed to test your knowledge of the Year 7 AQA Statistics unit. It contains five questions covering data collection, representation and analysis. You should try to complete it within 30 minutes. The questions include tally charts, bar charts, pie charts, line graphs, two-way tables, and calculations of averages and range. After each question, we provide a detailed step-by-step solution so you can see exactly where marks are awarded.
这份模拟试卷旨在测试你对七年级AQA统计单元知识的掌握情况。试卷包含五道题目，涵盖数据收集、数据表示和数据分析。你应尝试在30分钟内完成。题目包括计数表、条形图、饼图、折线图、双向表以及平均数和极差的计算。每道题后，我们都会给出详细的分步解答，以便你准确了解得分点。
Before you begin, note the topic of each question and the number of marks it carries. The number of marks tells you how much working the examiner expects: a 2-mark question needs two clear steps, while an 8-mark question needs a full method, correct working and a final answer with units.
开始之前，请先看清每道题的主题和分值。分值决定了阅卷人期待的解题步骤：2分题需要两个清晰步骤，8分题则需要完整的方法、正确的过程以及带单位的最终答案。
| Question | Topic | Marks | Suggested time |
|---|---|---|---|
| 1 | Tally charts, frequency and mode | 5 | 4 minutes |
| 2 | Bar charts and frequency | 7 | 5 minutes |
| 3 | Pie charts and angles | 8 | 6 minutes |
| 4 | Line graphs and time series | 8 | 6 minutes |
| 5 | Two-way tables, averages and range | 12 | 9 minutes |
| Total | All five topics | 40 | 30 minutes |
Work through the paper with a pencil, a ruler and a protractor. Statistics is a practical topic, and much of the credit in AQA papers goes to accurate drawing and clear labelling rather than to arithmetic alone.
请用铅笔、直尺和量角器完成整份试卷。统计是一个偏实践的单元，在AQA的试卷中，很多分数给的是准确的作图和清晰的标注，而不仅仅是计算本身。
2. Question 1: Tally Charts and Mode | 第1题：计数表与众数
A class of 20 students were asked about their favourite colour. Their responses were recorded in a tally chart. Complete the frequency table and state the mode.
一个班级的20名学生被问及他们最喜欢的颜色。他们的回答被记录在一个计数表中。请完成频数表并指出众数。
Data given:
所给数据：
| Colour | Tally | Frequency |
|---|---|---|
| Red | IIII | ? |
| Blue | IIII II | ? |
| Green | III | ? |
| Yellow | II | ? |
| Other | IIIII | ? |
| Total | ? |
In a tally chart, each single stroke stands for one pupil. In your exam you will often see a group of four strokes crossed by a diagonal line, which also counts as five. Here the strokes are written one at a time so that they are easy to count.
在计数表中，每一条短线代表一名学生。在正式考试里，你常常会看到四条竖线被一条斜线划掉，这一组同样代表五个。本题中把短线逐条写出，方便清点。
Step 1 - Count each tally row. so the frequency is 6. Green has 3 strokes, Yellow has 2 strokes and Other has 5 strokes.
第一步——清点每一行的短线。红色有4条短线，频数为4；蓝色有4 + 2 = 6条，频数为6；绿色3条，黄色2条，其他5条。
| Colour | Tally | Frequency |
|---|---|---|
| Red | IIII | 4 |
| Blue | IIII II | 6 |
| Green | III | 3 |
| Yellow | II | 2 |
| Other | IIIII | 5 |
| Total | 20 |
Step
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