A-Level WJEC Statistics: Unit Test Mock Paper Walkthrough | A-Level WJEC 统计：单元测试模拟卷解析

📚 A-Level WJEC Statistics: Unit Test Mock Paper Walkthrough | A-Level WJEC 统计：单元测试模拟卷解析

This article provides a full walkthrough of a mock unit test designed for WJEC A-Level Statistics, covering key topics such as data presentation, probability, discrete random variables, binomial and normal distributions. Each solution is explained step by step to strengthen exam technique.

本文提供一份针对WJEC A-Level统计单元测试模拟卷的完整解析，涵盖数据展示、概率、离散随机变量、二项分布与正态分布等核心主题，逐步讲解解题思路以增强应试技能。

1. Mock Paper Overview | 模拟卷概述

This mock paper is modelled on the WJEC AS Statistics unit and contains five multi-part questions worth a total of 60 marks, with a recommended time of 75 minutes. The content addresses stem-and-leaf diagrams, box plots, outliers, measures of location and spread, Venn diagrams, conditional probability, independence, discrete random variables, expectation, variance, the binomial distribution and the normal distribution, including inverse normal calculations and a small sampling component.

本模拟卷仿照WJEC AS统计单元设计，包含五道多小问题目，满分60分，建议答题时间75分钟。内容涵盖茎叶图、箱线图、离群值、位置与离散测度、维恩图、条件概率、独立性、离散随机变量、期望、方差、二项分布与正态分布，以及逆正态计算和抽样问题。

2. Question 1 – Stem-and-Leaf Diagram, Median, IQR & Outliers | 题目1 – 茎叶图、中位数、四分位距与离群值

Question 1 (12 marks). A stem-and-leaf diagram shows the test scores of 20 students. Key: 1|5 means 15. Data: 1 | 5 ; 3 | 2 ; 4 | 0 2 4 6 6 8 9 ; 5 | 1 2 3 5 7 8 9 ; 6 | 0 3 3 5.

题目1（12分）。某茎叶图显示了20名学生的测验成绩。数据钥：1|5 表示15。数据：1 | 5 ；3 | 2 ；4 | 0 2 4 6 6 8 9 ；5 | 1 2 3 5 7 8 9 ；6 | 0 3 3 5。

First, list the 20 values in ascending order: 15, 32, 40, 42,

Published by TutorHao | A-Level 统计 Revision Series | aleveler.com

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