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AQA GCSE Maths Graphs and plots

Graphs and plots

This page covers the following topics:

1. Time series
2. Scatter graphs
3. Box plots
4. Pictograms
5. Histograms

Time series graphs are used to represent data collected over time.

Time series

Scatter graphs use a line of best fit, drawn centrally through the points, to show correlations between variables; extend the line to extrapolate (estimate) values outside the range of data given.

Scatter graphs

Box plots visually display the median, quartiles and interquartile range of a data set against a scale.

Box plots

Pictograms display data using symbols that makes information visually easier to understand and uses a key to show what each symbol presents. Below is an example displaying the number of cupcakes sold each day at a cafe.

Pictograms

Histograms are used when class intervals are unequal. Frequency is represented by the area of the bar; the height of each bar is called the frequency density and there are no gaps between the bars.

Histograms

1

Ben constructs this box plot to display the 400m and 600 run times of his classmates. State 2 comparisons you can make between the two sets of data.

Ben constructs this box plot to display the 400m and 600 run times of his classmates. State 2 comparisons you can make between the two sets of data.

2

A study surveys some families and constructs a histogram of how much they each spend on food in a week. 20 families spend between Β£20-Β£30. Estimate how many families spend over Β£40.

A study surveys some families and constructs a histogram of how much they each spend on food in a week. 20 families spend between Β£20-Β£30. Estimate how many families spend over Β£40.

3

This list shows the number of hours per day Aaron spends on his homework over 10 days: 3, 2.5, 0.5, 2, 2.75, 2, 3.5, 1, 2, 2.5. Construct a box plot of the data.

This list shows the number of hours per day Aaron spends on his homework over 10 days: 3, 2.5, 0.5, 2, 2.75, 2, 3.5, 1, 2, 2.5. Construct a box plot of the data.

4

This pictogram shows the number of fish in different tanks in an aquarium; what is the average number of fish in a tank?

This pictogram shows the number of fish in different tanks in an aquarium; what is the average number of fish in a tank?

5

This table shows how much exercise, e, a group of students do per week, use it to draw a histogram: Hours of exercise, Frequency; 0<e≀0.5, 5; 0.5<e≀1.5, 15; 1.5<e≀2.5, 20. 2.5<e≀4, 11.

This table shows how much exercise, e, a group of students do per week, use it to draw a histogram: Hours of exercise, Frequency; 0<e≀0.5, 5; 0.5<e≀1.5, 15; 1.5<e≀2.5, 20. 2.5<e≀4, 11.

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