1. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
No. of students 2 7 20 41 63 38 8

2. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students 2 7 20 41 63 38 8

3. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
130 2
140 7
150 20
160 41
170 63
180 38
190 8

4. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7
150 20
160 41
170 63
180 38
190 8

5. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7
150 20
160 41
170 63
180 38
190 8

6. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7 9
150 20
160 41
170 63
180 38
190 8

7. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7 9
150 20 29
160 41
170 63
180 38
190 8

8. Cumulative Frequency Diagrams
The following frequency table shows the heights of a group of students in centimetres:
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7 9
150 20 29
160 41 70
170 63
133
180 38
171
190 8
179

9. We plot cumulative frequency against upper class value.
Height (cm)
Upper class value
No. of students
Cumulative frequency
130 2
140 7 9
150 20 29
160 41 70
170 63
133
180 38
171
190 8
179

10. We plot cumulative frequency against upper class value.
130 2
140 9
150 29
160 70
170
133
180
171
190
179

11. We plot cumulative frequency against upper class value.
130 2
140 9
150 29
160 70
170
133
180
171
190
179

12. We plot cumulative frequency against upper class value.
130 2
140 9
150 29
160 70
170
133
180
171
190
179

13. We plot cumulative frequency against upper class value.
130 2
140 9
150 29
160 70
170
133
180
171
190
179

14. The median is the 90th value
The median is about 163 cm

15. The lower quartile is the 45th value
The lower quartile is about 155 cm

16. The upper quartile is the 135th value
The upper quartile is about 170 cm

17. The Interquartile Range = upper quartile — lower quartile
= 170 — 155
= 15 cm