### Present Remotely

Send the link below via email or IM

Present to your audience

• Invited audience members will follow you as you navigate and present
• People invited to a presentation do not need a Prezi account
• This link expires 10 minutes after you close the presentation
• A maximum of 30 users can follow your presentation

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

### Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

# An introduction to Histograms

No description
by

## Marc Jones

on 25 November 2013

Report abuse

#### Transcript of An introduction to Histograms

An introduction to Histograms
Starter
Which one of these charts is the odd one out?

Why?
What is a histogram?
A histogram is a bar graph that shows how frequently data occur within certain ranges or intervals. The height of each bar gives the frequency density for the respective interval

Solution
In order to draw the Histogram we draw a graph (with the bars touching) of frequency density/speed
10
20
30
40
50
60
70
80
Age
Drawing a histogram
Frequency density
WILT
Recognise a histogram
Calculate the frequency density
Draw a histogram
5

4

3

2

1
To calculate the frequency density we use the following formula:
Calculating the frequency density
Frequency density =
Frequency
Class width
0.25
1.5
1.8
4
7
2
We cannot use a bar chart because we have continuous data.

We need to find the frequency density in order to draw a histogram
Mileage (m) Frequency Frequency density
0 ≤ m < 5 10
5 ≤ m < 15 40
15 ≤ m < 20 50
20 ≤ m < 30 70
30 ≤ m < 45 60
45 ≤ m < 50 40
2
4
10
7
4
8
5 10 15 20 25 30 35 40 45 50
Frequency density
Mileage (m)
0.25
1.5
1.8
4
7
2
Full transcript