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Cumulative frequency Cumulative frequency graph

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Presentation on theme: "Cumulative frequency Cumulative frequency graph"— Presentation transcript:

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

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