1. A student was seen acting suspiciously on the college bus park. Witnesses said that it was a male year 11 student. They said that he was about average height. When a teacher approached, the student ran away across the school field and left some foot prints in the mud. The teacher said that the size of the footprint was about average. As the student ran away, he dropped a packet of sweets. There was an average number of sweets in the packet.

2. Here are some people: Which one is average height ?

3. Here are some people: Which one is average height ? This average is called the MEDIAN.

4. THE MEDIAN Examples: 1)Seven people have the following heights in cm: 180, 175, 169, 178, 172, 165, 166 What is the median height? 2) In a test, the students in a class scored 25, 30, 17, 23, 19, 11, 21, 9, 15, 8 What is the median score?

5. THE MEDIAN Find the median: 1)3, 7, 10, 12, 16 2)3, 9, 1, 2, 10 3)8, 1, 2, 5, 12, 3

6. A student was seen acting suspiciously on the college bus park. Witnesses said that it was a male year 11 student. They said that he was about average height. When a teacher approached, the student ran away across the school field and left some foot prints in the mud. The teacher said that the size of the footprint was about average. As the student ran away, he dropped a packet of sweets. There was an average number of sweets in the packet.

7. Here are some packets of sweets: 7 44 46 5 55 5 5 This average is called the MEAN.

8. THE MEAN Examples: 1)Six boxes contain the following numbers of matches: 18, 10, 12, 15, 20 What is the average (mean) number of matches? 2) In a test, the students in a class scored 25, 30, 17, 23, 19, 11, 21, 9, 15, 8 What is the average (mean) score?

9. THE MEAN Find the mean: 1)3, 7, 10, 15, 20 2)3, 9, 1, 2, 10 3)8, 1, 2, 5, 12, 8

10. A student was seen acting suspiciously on the college bus park. Witnesses said that it was a male year 11 student. They said that he was about average height. When a teacher approached, the student ran away across the school field and left some foot prints in the mud. The teacher said that the size of the footprint was about average. As the student ran away, he dropped a packet of sweets. There was an average number of sweets in the packet.