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Slide 2

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Objective: To draw a histogram.
Histograms
5.0
To draw a histogram we
first need to work out the
4.0 frequency density.
3.0
Frequency
Frequency density = frequency
density
class interval
2.0 20
1.0
f. d. = 30 ÷ 20 = 1.5
30
0
20 40 60 80 100
Age( A years)
J. Chandarana & Lesley Hall @ Soar Valley College…read more

Slide 3

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Objective: To draw a histogram.
Histograms
add a column to work
Draw a histogram for this data
out frequency density
Age ( A years) Frequency Frequency density
0 A < 20 28 28 ÷ 20 = 1.4
20 A < 30 36
36 ÷ 10 = 3.6
30 A < 40 48 48 ÷ 10 = 4.8
40 A < 50 20
20 ÷ 10 = 2
50 A < 70 30 30 ÷ 20 = 1.5
70 A < 100 15 15 ÷ 30 = 0.5
Frequency density = frequency
class interval
J. Chandarana & Lesley Hall @ Soar Valley College…read more

Slide 4

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Objective: To draw a histogram.
Histograms
Age
5.0 F.d
(A years)
0 A < 20 1.4
4.0
20 A < 30 3.6
3.0
Frequency
30 A < 40 4.8
density
2.0 40 A < 50 2
1.0 50 A < 70 1.5
0 70 A < 100 0.5
20 40 60 80 100
Age( A years)
J. Chandarana & Lesley Hall @ Soar Valley College…read more

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