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IGCSE MATHEMATICS (0580) – STATISTICS

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-- Statistics - Statistics - RP IGCSE Mathematics

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  • Statistics Statistics
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Learners often confuse key concepts when studying statistics. They can find it difficult to select from the wide range of techniques available to them and fail to make links with prior knowledge; for instance relating positive and negative correlation to the positive and negative gradient of the line of best fit. Some learners struggle with unfamiliar data representations. For example, finding it difficult to grasp concepts such as back-to-back stem and leaf diagrams, 3D pie charts and plotting median, upper and lower quartiles on box-and-whisker plots. Another obstacle can be the language used in statistics. This unit offers learners the opportunity to gain a better understanding of statistics. They will explore a number of diagrammatic data representations, interrogating them statistically and then drawing conclusions from them. Throughout the unit learners will experience opportunities to develop their mathematical vocabulary. This unit of work is just one of several approaches that you could take when teaching this topic, and you should aim to adapt the resources to match the ability level of your learners, as well as your school context.

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Teaching pack - Statistics

-->Test Maker is an online service that makes it easy for you to create high-quality, customised test papers for your learners using Cambridge questions.

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Cambridge IGCSE(0580) worksheets

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Statistics and Probability – IGCSE Maths 0580

  • Data display
  • Mean, median and mode
  • Cumulative frequency
  • Simple probability
  • Exclusive and independent events
  • Tree diagrams

** new updates for 2020 syllabus – Stem and leaf diagrams – Conditional probability – Possibilty diagrams – Venn Diagrams related past year questions from 2005 to 2010. (past year exam questions explained in video)

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Resources and links for mathematics students, igcse extended mathematics revision by topic, revision sheet – all topics, revision by topic.

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Statistics Genie

GCSE Statistics Revision: topics not in GCSE Maths, revision videos, past exam papers and model solutions.

Notes on Types of Sampling and Data Collection

New Specification Edexcel GCSE Statistics Exam Papers

Edexcel higher gcse statistics exam papers, edexcel foundation gcse statistics exam papers, higher gcse statistics topics, from gcse maths old spec, from gcse maths new spec.

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GCSE Maths Topics

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GCSE Maths

Statistics – Maths GCSE

Here we will learn about statistics maths, including types of data, averages and range, sampling methods and representing data.

There are also statistics worksheets based on Edexcel, AQA and OCR exam questions, along with further guidance on where to go next if you’re still stuck.

What is statistics?

Statistics is the practice of collecting, processing and analysing data .

Statistical analysis can be used to create mathematical models of situations such as weather patterns, global financial markets or the behaviour of humans or animals.

In this page we will link to lots of other pages that will help with a variety of statistics topics that are examined in both foundation and higher GCSE. Some have already been seen in key stages 2 and 3.

These and other topics are also covered in GCSE Statistics and are extended further in A Level Maths and A Level Statistics.

Here are the different areas of statistics that may be examined in GCSE mathematics. Each of the sections will include exam practice questions and mark schemes. 

What is statistics?

Statistics maths worksheet

Get your free statistics maths worksheet of 20+ questions and answers. Includes reasoning and applied questions.

Types of data

Types of data are collected and used for research purposes. 

They can be used to find information about the population of a town or country, or used by a business to plan advertising campaigns or used to make predictions about the future.

We need to understand the different kinds of data that can be collected and the different statistical ways it can be analysed or interpreted. 

The different types of data we need to know are,

  • Primary data – data collected from an original source
  • Secondary data – data collected from a secondary source
  • Qualitative data – non-numerical data
  • Quantitative data – numerical data
  • Discrete data – exact values or whole numbers that are not rounded
  • Continuous data – measurements that are rounded

Step-by-step guide: Types of data

Frequency table

A frequency table is a way of organising collected data.

We use frequency tables to find descriptive statistics . These values help describe the set of data such as the mean , median and mode of a set of data. 

For example,

Organise the colours of the 12 shirts in a wardrobe into a frequency table.

Statistics frequency tables image 1

Organising this into a frequency table, we have

Statistics frequency tables image 2

Numerical data can also be organised into grouped data . Here the data is put into different classes with class intervals. Groups must not overlap and be able to contain all data values.

A grouped frequency table showing the heights of 15 students.

Statistics frequency tables image 3

Step-by-step guide: Frequency table

Mean, median and mode

The mean, median and mode in maths are averages.

Averages are measures of central tendency , they are values that can be used to represent a set of data. 

We will look at three averages – mean, median and mode.

Step-by-step guide: Mean, median and mode

The sum of the values, divided by the number of values. 

For example, calculate the mean from this list of data. 

The mean is 4.57 \ (2dp).

Step-by-step guide: Mean

Arrange the values in numerical order , from the smallest value to the highest value and find the middle value .

For example, find the median of this set of numbers,

Statistics median image 1

The median is 5.

Step-by-step guide: Median

The most frequently occurring item in the data set.

For example, find the mode of this list of numbers,

The most frequently occurring item is 6.

The mode is 6.

Step-by-step guide: Mode or modal

The range is a measure of how spread out a set of data is.

To calculate the range we find the difference between the highest value and the lowest value .

The highest value is sometimes called the largest value or largest number.  

The lowest value is sometimes referred to as the smallest value or smallest number.

For example, work out the range.

The range is 8.

Step-by-step guide: Range

Representing data

Once data has been collected it can be represented in many different ways. This will depend on the type of data collected and what the data is being used for.

Here are some of the different ways data may be represented in GCSE Mathematics.

Statistics Representing data table part 1

Step-by-step guide: Representing data

Cumulative frequency

Cumulative frequency is the running total of frequencies in a frequency distribution .

Cumulative frequency graphs (or cumulative frequency diagrams) are useful when representing or analysing the distribution of large grouped data sets .

They can also be used to find estimates for the median value, the lower quartile and the upper quartile for the data set.

Step-by-step guide: Cumulative frequency

Statistics cumulative frequency

It is convenient to construct a box plot (or a box and whisker diagram) directly below a cumulative frequency curve.

This is because we can locate an estimate for the required values (the lower quartile, the median, and the upper quartile) using the structure in the image above, along with the highest and lowest values for the range.

Step-by-step guide: Box plot

Histograms are similar to bar charts but are used to display qualitative continuous data , whereas a bar chart is used to display qualitative or quantitative discrete data .

In a bar chart, the heights of the bars represent the frequencies, whereas in a histogram the area of the bars represent the frequencies .

To draw a histogram we need to find the frequency density of each class interval.

The frequency density (D) of a class interval is equal to the frequency (F) divided by the class width (W).

Statistics histograms

Step-by-step guide: Histograms

Sampling methods

Sampling methods are ways to select a sample of data from a given population (every individual in the whole group).

It is unrealistic to collect data from the entire population because it

  • takes too much time
  • costs too much money.

We therefore take an appropriate sized sample as a way of representing the population.

Some sampling methods will be more suitable than others for different situations.

Whichever sampling method is used it is important to justify why that method has been used.

There are several types of probability sampling methods and non-probability sampling methods you should be aware of,

  • Random sampling
  • Stratified sampling
  • Systematic sampling
  • Non random sampling
  • Capture recapture

Step-by-step guide: Types of sampling methods

Common misconceptions

  • Mixing up the averages

Check if you have been asked for the median, mode or mean average.

  • Ascending order

Check that the list of numbers is in numerical order before finding the median number.

  • Using the endpoints, not the midpoints for frequency polygons

The coordinate must be plotted at the centre of each class interval, at the given frequency.

  • Plotting at the midpoint of each class interval for a cumulative frequency graph

Points on a cumulative frequency graph are always plotted using the upper class boundary of each group – unlike a frequency polygon, which uses the midpoints.

  • Frequency vs frequency density

A very common error that occurs in histogram questions is that the frequency is used instead of the frequency density . Frequency density must be found because the groups provided in the frequency table are usually not equal width.

Practice statistics maths questions

1. Annie conducted a survey in her class to find the favourite colour of her classmates. Which option best describes the type of data she found?

Primary and qualitative

GCSE Quiz True

Secondary and qualitative

GCSE Quiz False

Primary, quantitative and continuous

Primary, quantitative and discrete

She collected the data herself and the data is non-numerical.

2. Calculate the mean of the following set of numbers.

3. The stem and leaf diagram below represents a sample of the lengths of leaves from a tree.

Statistics practice question 3

Which average would be least suitable to represent the data?

The mean would be the least suitable as there is a large outlier which will affect the value of the mean.

4. The frequency table shows the heights of 20 shrubs. Find the estimate for mean height.

Statistics practice question 4

We need to multiply the heights by their frequencies to get the total height of all 20 shrubs.

The estimate of the mean is 43.

5. Below is a grouped frequency table for the length of 50 pieces of string. Calculate the two missing cumulative frequencies.

Statistics practice question 5

Add 15 to the 6 in the cumulative frequency column to get 21, then add 21 to that to get 42.

6. When drawing a histogram, which formula would correctly calculate the frequency density for a class interval?

The frequency density is the frequency per unit for the data in each class interval.

Statistics maths GCSE questions

1. A pie chart shows the proportion of people who answered Yes or No to a question. The ratio of “yes” answers to “no” answers is 5:7.

Statistics gcse question 1

What is the angle of the “No” sector?

Circle your answer.

2. A class contains 14 boys and 13 girls. The mean height of 14 boys is 172 \ cm. The mean height of the whole class is 165 \ cm.

Find the mean height of the girls. Give your answer to two decimals places.

Total height of the 14 boys (2408) or  total height of the class (4455) .

Total height of the girls (2047) .

3. The histogram shows information about the time it took 348 people to complete a quiz. 160 people took between 16 and 20 seconds to complete the quiz.

What percentage of people took under 16 seconds to complete the quiz?

Statistics gcse question 3

The most popular lessons are

  • Averages from frequency tables
  • Mode from a frequency table

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GCSE Statistics (MEP – GCSE) worksheets

GCSE Statistics (MEP – GCSE) worksheets

Subject: Mathematics

Age range: 14-16

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28 November 2013

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