1. Cumulative frequency Cumulative frequency graph
Cumulative frequency table
Cumulative frequency graph

2. Measuring the middle of a distribution
The mean
The mode
The arithmetic average obtained by adding all the scores and dividing by the total number of scores
The score which occurs most frequently

3. Middle of a distribution
The median
When placed in order from smallest to largest, the middle score

4. Find mean mode and median of…
b) 13, 12, 15, 13, 18, 14, 16, 15, 15, 17

5. Percentiles In a cumulative frequency graph….
The 25th percentile is called the lower quartile
The 50th percentile is the middle value (median value)
The 75th percentile is called the upper quartile

6. The interquartile range
Interquartile range = upper quartile – lower quartile

7. Box and Whisker Plots A 5 figure visual display of a data set
The minimum value
The lower quartile
The median
The upper quartile
The maximum value

8. Box and whisker plots