Diagrams, charts and graphs
Diagrams, charts and graphs

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Diagrams, charts and graphs

2.4.1 Try some yourself

Activity 13

The frequency diagram below shows the numbers of people in different age groups in a sample of the UK population.

  • (a) What is the width of each age group?

  • (b) Which age group contains the largest number of people?


  • (a) The width of each age group is 10 years. For example, the ten ages 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 years make up the first age group.

  • (b) The largest number of people are in the age group 10 and above but less than 20 years.

Activity 14

The bar chart below represents the numbers of cars predicted to be sold by one company in nine successive years.

  • (a) How many cars were predicted to be sold in 2010?

  • (b) How many cars were predicted to be sold in 2015?

  • (c) What does the bar chart suggest about the pattern of predicted sales?


  • (a) About 12 000.

  • (b) About 21 000.

  • (c) Generally the sales figures are increasing, although there was a slight fall in 2012.

Activity 15

This table summarises the results of a survey of 300 people who were asked how long it took them to get from Central London to Heathrow Airport.

Time/minsNumber of people
  • (a) Illustrate the information by means of a frequency diagram. (You may find it easiest to draw your frequency diagram on graph paper.)

  • (b) What does the width of each interval represent?


  • (a)

  • (b) The width of each interval represents 5 minutes of journey time.


Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371