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An introduction to Histograms
Transcript of An introduction to Histograms
Which one of these charts is the odd one out?
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
In order to draw the Histogram we draw a graph (with the bars touching) of frequency density/speed
Drawing a histogram
Recognise a histogram
Calculate the frequency density
Draw a histogram
To calculate the frequency density we use the following formula:
Calculating the frequency density
Frequency density =
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
5 10 15 20 25 30 35 40 45 50