Summarising numerical data

Further Mathematics: Units 3 and 4

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This video looks at the median. range and Interquartile Range with a view to measures of spread of data. Whilst we have looked at using the Range before, it isn't very useful if there are outliers. Hence, we can use a new idea called the Interquartile Range to help us look at the range of the middle 50 percent of the data. This means that outliers have less of an impact. There are a number of worked examples which show how to find the IQR. There is also some great exam help and information.

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The median
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Median
Range
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How do I find the IQR
Examples of finding the IQR