1. 1

2. Bar charts
2

3. Pictograms
3

4. 4

5. Pie charts
5

6. Food pyramid pie chart
6

7. The mean
The mean is also known as the common average.
Find the mean of this set of data:
7, 5, 2, 6, 12, 10, 4, 8, 9
7

8. The mode
The mode is the data value that occurs most frequently.
The following are the number of matches found in 14
boxes randomly chosen.
The mode number of matches is.........
8

9. The median
The median value of a set of data is the value in the
middle once the data has been ordered.
7, 5, 2, 6, 12, 10, 4, 8, 9, 3
9

10. 10

11. The table shows the marks otained by a group of students.
mark 1 2 3 4 5 6
frequency 5 9 16 18 20 7
• Find the total number of students in this sample n=75
• Find the mean mark mean =3.8
• Find the median mark.
median =4
• What is the mode of this distribution? mode=5
11

12. The range
The range is a measure of spread and it is
largest data value­ smallest data value
range:
7, 5, 2, 6, 12, 10, 4, 8, 9 range:
mark 1 2 3 4 5 6
range:
frequency 5 9 16 18 20 7
12

13. The heights of dogs have been measured
Heights ( mm) mean = 394 mm
600
470 median = 430 mm
170
300
430 range = 430
13