2. MEAN is the total of a set of statistics divided by the number of statistics in the set. studentHeight (cm) 1 187 2 176 3 155 4 5 173 6 162 7 168 8 159 9 148 10 163 11 167 12 164 Total 1977 To calculate the mean height of 12 students simply total the heights Then ÷ by the total number of students 1977 = 12 164.75cmMEAN = 164.75cm

3. MEDIAN is the middle figure in a set of statistics when they are in rank order studentHeight (cm) 1 187 2 176 3 155 4 5 173 6 162 7 168 8 159 9 148 10 163 11 167 12 164 Total 1975 To get the median put the statistics into rank order Then find the middle number studentHeight (cm) 1 187 2 176 3 173 4 168 5 167 6 164 7 163 8 162 9 159 10 155 11 155 12 148 Because there is an even number of figures (12) you need to add the two middle figures and divide by two

4. MEDIAN is the middle figure in a set of statistics when they are in rank order studentHeight (cm) 1 187 2 176 3 173 4 168 5 167 6 164 7 163 8 162 9 159 10 155 11 153 12 148 164 + 163 2 = 163.5cm Median = 163.5cm

5. MODE is the figure in a set of statistics that occurs the most frequently studentHeight (cm) 1 187 2 176 3 173 4 168 5 167 6 164 7 163 8 162 9 159 10 155 11 155 12 148 155 cm is the MODE because it occurs twice Mode = 155cm

6. RANGE is the difference between the highest figure and lowest figure studentHeight (cm) 1 187 2 176 3 173 4 168 5 167 6 164 7 163 8 162 9 159 10 155 11 155 12 148 Highest – Lowest = Range 187 - 148= 39 cm Range = 39 cm

7. Hamish McMillan Head of Geography Saint Kentigern College Martin. F & Butler. J (1984)Geography Skills for GCSE and Standard Grade. N.S.W, Jacaranda Press.