Diagrams, charts and graphs
◄Previous: 2.4 Bar charts and frequency diagrams

# 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?

## Answer

- (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?

## Answer

- (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/mins | Number of people
--- | ---
30–35 | 30
35–40 | 60
40–45 | 110
45–50 | 50
50–55 | 30
55–60 | 10
60–65 | 10
Total | 300

- (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?

## Answer

- (a)

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

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