# Cumulative frequency Cumulative frequency graph

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Cumulative frequency Cumulative frequency graph
Cumulative frequency table Cumulative frequency graph

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

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

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

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

The interquartile range
Interquartile range = upper quartile – lower quartile

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

Box and whisker plots