Cambridge Checkpoint Maths Workbook 7 Solutions – Unit 3: Data collection and sampling

Welcome to our comprehensive solution guide for the Cambridge Checkpoint Lower Secondary Mathematics Workbook 7, proudly published by Hodder Education. This carefully curated guide is designed to support students, teachers, and parents with clear, accurate, and well-explained step-by-step solutions for every unit in the workbook.

In this particular post, we focus on Unit 3: Data Collection and Sampling, which includes Exercises 3.1 - 3.2, and 3.3. These exercises build a strong foundation in data handling by introducing learners to practical methods of collecting and representing data. Each solution aims to promote conceptual understanding, reinforce key skills, and prepare learners for assessments with confidence and clarity.

Whether you’re a learner trying to self-study, a teacher guiding classroom discussions, or a parent supporting homework, these worked examples are a valuable revision companion. Our explanations go beyond just giving answers—they help you understand the "why" behind each step.

⚠️ Disclaimer

This content is independently prepared by Ugwoke Charles and is not affiliated with or endorsed by Hodder Education or Cambridge Assessment International Education. All rights to the original workbook remain with the publisher. The solutions provided here are intended solely for educational support and revision purposes. Users are strongly encouraged to purchase and use the official workbook for a complete learning experience.

✔️ Solutions

Question 1: Decide which of the following types of data are discrete, which are continuous and which are categorical. Tick the correct box.
a Wing span of birds (cm)
\( \;\;\;\;\;\; \) [ \( \; \) ] Discrete \( \;\;\;\;\;\; \) [ \( \; \) ] Continuous \( \;\;\;\;\;\; \) [ \( \; \) ] Categorical
b The favourite colours of students in your class
\( \;\;\;\;\;\; \) [ \( \; \) ] Discrete \( \;\;\;\;\;\; \) [ \( \; \) ] Continuous \( \;\;\;\;\;\; \) [ \( \; \) ] Categorical
c Number of marbles in a bag
\( \;\;\;\;\;\; \) [ \( \; \) ] Discrete \( \;\;\;\;\;\; \) [ \( \; \) ] Continuous \( \;\;\;\;\;\; \) [ \( \; \) ] Categorical
d Weight of dogs (kg)
\( \;\;\;\;\;\; \) [ \( \; \) ] Discrete \( \;\;\;\;\;\; \) [ \( \; \) ] Continuous \( \;\;\;\;\;\; \) [ \( \; \) ] Categorical

Question 2: Fill in the following defintions using the words below. Use each word once. One word will not be used.
a ............................................ data can only take specific values
b ................................................ data can take any value.
c Data that cannot be measured numerically is known as ................ data
d The ..................................... of a data collection is the total number of people that could be asked.
e The ..................................... of a data collection is the number of people from the population that were asked.
f Write your own definition for the word not used above.
\( \;\;\;\;\;\; \) ...............................................................................................
\( \;\;\;\;\;\; \) ...............................................................................................

Question 3: Give three examples of continuous data and the unit they could be measured in. One has been done for you.